Plural Gaps Patents (Class 360/121)
  • Patent number: 10839831
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head and a second write head. The first write head comprises a first main pole, a first yoke having a first length, and a first coil wrapped around the first yoke. The second write head comprises a second main pole, a second yoke having a second length, a second coil wrapped around the second yoke, and a side shield surrounding two or more surfaces of the second main pole. The side shield comprises a heavy metal layer and a magnetic layer. The second write head comprises an energy-assisted magnetic recording element or stack. The second write head comprises a non-magnetic conductive structure to enable maximum current efficiency and uniformity. A write of the first write head is wider than that of the second write head.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: November 17, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Thao A. Nguyen, Michael Kuok San Ho, Zhigang Bai, Zhanjie Li, Quang Le
  • Patent number: 10832712
    Abstract: An apparatus, in accordance with one approach, includes a module having a first array of read transducers. A first electrical shielding layer is positioned above the first array of read transducers. An array of write transducers is positioned above the first electrical shielding layer. A second electrical shielding layer is positioned above the array of write transducers. A second array of read transducers is positioned above the second electrical shielding layer.
    Type: Grant
    Filed: January 21, 2020
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: David Seagle, Robert Biskeborn, Calvin Shyhjong Lo
  • Patent number: 10789976
    Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a second shield, a first stacked body and a second stacked body. At least a portion of the magnetic pole is provided between the first and second shields. The first stacked body is provided between the magnetic pole and the first shield. The second stacked body is provided between the magnetic pole and the second shield. The first stacked body includes a first magnetic layer including, a first conductive layer provided between the magnetic pole and the first magnetic layer, and a second conductive layer provided between the first magnetic layer and the first shield. The second stacked body includes a second magnetic layer including, a third conductive layer provided between the magnetic pole and the second magnetic layer, and a fourth conductive layer provided between the second magnetic layer and the second shield.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: September 29, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Naoyuki Narita, Tomoyuki Maeda
  • Patent number: 10770102
    Abstract: A tape drive-implemented method, according to one embodiment, includes: using information read from one or more servo bands on a magnetic tape to position a magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of servo readers is positioned at each end of the array of data transducers. A distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands. Furthermore, the distance between each of the servo readers in each of the groups and the prespecified width are both measured in a direction perpendicular to the direction of travel of the magnetic tape.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: September 8, 2020
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Giovanni Cherubini, Simeon Furrer, Mark A. Lantz, Kazuhiro Tsuruta
  • Patent number: 10614846
    Abstract: A computer-implemented method for measuring servo to servo reader spacing in a module, according to one embodiment, includes cause emission of a measurable electro-magnetic signal from two writer elements that are fixed at a same span as a nominal servo reader spacing. The writer elements are positioned in multiple relative positions along a transducer array of a module having servo readers in the transducer array. The strength of the electro-magnetic signal detected by each servo reader is measured at the multiple relative positions. A determination is made, from the measured strengths, whether the servo reader span matches the nominal servo reader spacing.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: April 7, 2020
    Assignee: International Business Machines Corporation
    Inventor: David Harper
  • Patent number: 10580442
    Abstract: An apparatus, according to one embodiment, includes: a module; and a plurality of tunnel valve read transducers arranged in an array extending along the module. Each of the tunnel valve read transducers includes: a sensor structure having a tunnel barrier layer and a free layer. Moreover, each of the tunnel valve read transducers includes a pair of hard bias magnets which sandwich the respective sensor structure therebetween, the hard bias magnets being positioned on opposite sides of the sensor structure along a cross-track direction. Furthermore, a thickness of each of the hard bias magnets at a thickest portion thereof is at least 10 times greater than a thickness of the free layer. Other systems, methods, and computer program products are described in additional embodiments.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: March 3, 2020
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Hugo E. Rothuizen
  • Patent number: 10418054
    Abstract: A dual PMR writer is disclosed wherein a first main pole (MP1) in writer 1 is a mirror image of a second main pole (MP2) in writer 2 with respect to a center plane aligned orthogonal to the air bearing surface (ABS). MP1 and MP2 may have an asymmetrical top-down shape to reduce writer-writer spacing (WWS) and read write offset (RWO) when a single or double reader is positioned down-track at the center plane. Accordingly, there is less track misregistration and better area density capability. Each of MP1 and MP2 as well as a top yoke (TY), and a tapered bottom yoke (tBY) have a rectangular back portion of width “w” from 4 to 10 microns. Spacing between MP1 and MP2 back portions may be ?4 microns to prevent cross-talk. RWO is reduced from ?4 microns for symmetrical TY/MP/tBY shapes to 3 microns or less for asymmetrical shapes.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: September 17, 2019
    Assignee: Headway Technologies, Inc.
    Inventor: Yue Liu
  • Patent number: 10388312
    Abstract: A tape drive-implemented method, according to one embodiment, includes: using information read from one or more servo bands on a magnetic tape to position a magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of servo readers is positioned at each end of the array of data transducers. A distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands. Furthermore, the distance between each of the servo readers in each of the groups and the prespecified width are both measured in a direction perpendicular to the direction of travel of the magnetic tape.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: August 20, 2019
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Giovanni Cherubini, Simeon Furrer, Mark A. Lantz, Kazuhiro Tsuruta
  • Patent number: 10354679
    Abstract: An apparatus according to one embodiment includes a first read transducer having a tunnel valve structure, and a second read transducer coupled to the first read transducer. The second read transducer has a tunnel valve structure as well, but the tunnel valve structure of the first read transducer has a different resistivity than the tunnel valve structure of the second read transducer. An apparatus according to another embodiment includes an array of first read transducers, each first read transducer having a tunnel valve structure. At least a second read transducer is coupled to the first read transducers, the second read transducer having a tunnel valve structure. The tunnel valve structure of the first read transducer has a different resistivity than the tunnel valve structure of the second read transducer.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: July 16, 2019
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Calvin S. Lo
  • Patent number: 10074393
    Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9?l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: September 11, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 10062834
    Abstract: The present invention provides an electromagnetic conversion device, comprising: an intermediate layer and electrode layers located on both sides of the intermediate layer, wherein the intermediate layer is a magnetoelectric layer. The electromagnetic conversion device realizes the direct conversion of charge and magnetic flux, and thus can be used as a fourth fundamental circuit element, so as to provide a new degree of freedom for the design of electronic circuits and information function devices. In addition, the electromagnetic conversion device can be used as memory elements to form a nonvolatile magnetoelectric information memory.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: August 28, 2018
    Assignee: INSTITUTE OF PHYSICS, CHINESE ACADEMY OF SCIENCES
    Inventors: Yang Sun, Yisheng Chai, Dashan Shang
  • Patent number: 10032471
    Abstract: An apparatus according to one embodiment includes a head having at least two modules, each having an array of transducers. Axes of the arrays are about parallel and are spaced from one another in an intended direction of tape travel thereacross. The array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module and the transducers of the second module are positioned to fill a contiguous data band with written tracks in multiple passes. All of the transducers of the first module are positioned on a first side of an imaginary line oriented in the intended direction of tape travel, and all of the transducers of the second module are positioned on a second side of the imaginary line.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: July 24, 2018
    Assignee: International Business Machines Corporation
    Inventor: Robert G. Biskeborn
  • Patent number: 10008226
    Abstract: A method and system for adjusting a servo head in a tape drive is disclosed. Position information for the servo head can be obtained and used to determine if an adjustment of one of the servo heads is necessary. By comparing the position of the tape against two servo heads, erroneous adjustments to the servo head can be obviated.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: June 26, 2018
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Tsuyoshi Miyamura, Eiji Ogura, Tomoko Taketomi, Kazuhiro Tsuruta
  • Patent number: 9997184
    Abstract: A tape drive-implemented method, according to one embodiment, includes: determining a servo band configuration of servo bands on a magnetic tape, using servo readers on a magnetic tape head to read one or more of the servo bands based on the determined servo band configuration, and using information read from the one or more of the servo bands to position the magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of the servo readers is positioned at each end of the array of data transducers, and a distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Giovanni Cherubini, Simeon Furrer, Mark A. Lantz, Kazuhiro Tsuruta
  • Patent number: 9947355
    Abstract: As disclosed herein a method for encoding information on tape using write offset gaps. The method includes receiving a request to write a dataset on a tape medium using a plurality of head groups, and identifying information to be encoded when writing the dataset. The method further includes determining a head group offset pattern that encodes the information, and writing the dataset using the head group offset pattern. Also disclosed herein is a method for decoding information on tape using write offset gaps. The method includes reading a dataset from a tape medium using a plurality of head groups, and determining a head group offset pattern used to read the dataset. The method further includes decoding information encoded in the head group offset pattern to provide decoded information. A computer program product corresponding to the above method is also disclosed herein.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Masayuki Iwanaga, Yutaka Oishi
  • Patent number: 9940954
    Abstract: A process according to one embodiment includes milling a media facing surface of a module having an array of sensors at a first angle, and milling the media facing surface of the magnetic head module at a second angle, not necessarily in that order. After the milling at the first and second angles, the media facing surface of the module is milled at a third angle between 55 degrees and 65 degrees from normal. An apparatus according to one embodiment includes a tape head module having an array of at least eight current perpendicular to plane sensors, wherein none of the sensors has a resistance more than about 10% away from the resistances of its nearest neighbors.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: April 10, 2018
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9928855
    Abstract: An apparatus according to one embodiment includes a module having a tape bearing surface, a first edge, and a second edge. A first tape tenting region extends from the first edge along the tape bearing surface toward the second edge. A transducer is located in a thin film region of the module. A distance from the first edge to the transducer is less than a distance from the second edge to the transducer. The transducer is positioned in the first tape tenting region.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: March 27, 2018
    Assignee: International Business Machines Corporation
    Inventor: Robert G. Biskeborn
  • Patent number: 9916860
    Abstract: A device for recording and/or reading data to and/or from a magnetic tape includes a read/write head which has a first device set including a first plurality of magnetic data write and/or read elements and a second device set including a second plurality of magnetic data write and/or read elements. The device also includes a lateral positioning actuator and an azimuth actuator. The lateral positioning actuator and azimuth actuator are used together to position both device sets on the magnetic tape. The lateral positioning actuator laterally positions the read/write head such that during write and/or read operations the first and second pluralities of magnetic data write and/or read elements align laterally to first and second pluralities of recordable and/or readable data tracks on the magnetic tape. The azimuth actuator rotates the read/write head about an azimuthal angle. such that the elements align to lateral spacings.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: March 13, 2018
    Assignee: ORACLE INTERNATIONAL CORPORATION
    Inventors: Darryl Wayne Yeakley, William J. Vanderheyden, Steven Gregory Trabert
  • Patent number: 9875758
    Abstract: A slider includes an array of two or more transducer sets offset from one another in a cross-track direction. Each transducer set includes at least one writer and at least one reader. All of the transducer sets are configured to operate simultaneously to perform any combination of reading and writing on two or more tracks of a recording medium. At least one actuator is included between two the transducer sets. The actuator is configured to adjust a cross-track spacing between the two transducer sets in response to a control current.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: January 23, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jon D. Trantham, Jason Bryce Gadbois, Mehmet Fatih Erden
  • Patent number: 9852747
    Abstract: An apparatus according to one embodiment includes a first module having a plurality of first write transducers, and a plurality of second modules each having a second write transducer. Planes of deposition of write gaps of the second write transducers are oriented at an angle of greater than 4 degrees relative to planes of deposition of write gaps of the first write transducers. An apparatus according to another embodiment includes a plurality of first modules each having a first write transducer, and a plurality of second modules each having a second write transducer. Planes of deposition of write gaps of the second write transducers are oriented at an angle of greater than 4 degrees relative to planes of deposition of write gaps of the first write transducers.
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: December 26, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Edwin R. Childers, Mark A. Lantz
  • Patent number: 9837107
    Abstract: A tape head including a body exhibiting a tape-bearing area is provided. The body comprises at least one transducer that is a read element or a write element, configured in the tape head so as for the tape head to read from or write to a magnetic tape, in operation. The tape-bearing area is essentially covered by an electrically conducting layer of material. This way, the exposed surface of the electrically conducting layer essentially forms the tape-bearing surface of the tape head, which surface contacts the magnetic tape, in operation. A tape head apparatus for recording or reproducing multi-track tapes including the tape head is also provided.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: December 5, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Johan Engelen, Mark A. Lantz, Hugo E. Rothuizen
  • Patent number: 9830943
    Abstract: A method for writing a servo pattern to a magnetic tape medium includes orienting a magnetic flux in opposite directions across gaps in the magnetic tape medium, and moving the magnetic tape medium with its servo band above two gaps in a direction along a longitudinal extension of the magnetic tape medium. The magnetic tape medium includes a servo band along the longitudinal extension of the magnetic tape medium and a servo pattern organized in a servo frame with a first burst having at least two servo stripes, and a second burst having at least two servo stripes. For at least one of the first and second bursts, different stripes within a same burst have opposite magnetic polarities with respect to one another. The method further includes applying a current pulse to the coil, moving the magnetic tape medium, and applying another current pulse to the coil.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: November 28, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Giovanni Cherubini, Johan B. C. Engelen, Simeon Furrer, Mark A. Lantz
  • Patent number: 9799355
    Abstract: In one general embodiment, a method includes forming a slot on a tape bearing surface of at least a chip having a thin film layer with a plurality of transducers therein, the slot defining a skiving edge. A second operation is performed on the tape bearing surface of at least the chip for removing a portion of the chip positioned on an opposite side of the slot as the transducers. In another general embodiment, an apparatus includes a substrate, a thin film layer on the substrate having transducers therein, and a portion of a slot extending along the substrate, the portion of the slot defining a skiving edge. A length of a tape bearing surface between the substrate and the skiving edge is in a range of about 7 to about 30 microns.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: October 24, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9786301
    Abstract: Apparatuses and methods for providing thin shields in a multiple sensor array are provided. One such apparatus is a magnetic read transducer including a first read sensor, a second read sensor, and a shield assembly positioned between the first read sensor and the second read sensor at an air bearing surface (ABS) of the magnetic read transducer, the shield assembly including a first shield layer assembly having a first footprint with a first area, and a second shield layer assembly having a second footprint with a second area, where the second area is greater than the first area.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: October 10, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Shaoping Li, Gerardo A. Bertero, Steven C. Rudy, Shihai He, Ming Mao, Haiwen Xi, Srikanth Ganesan, Qunwen Leng, Ge Yi, Rongfu Xiao, Feng Liu, Lei Wang
  • Patent number: 9786305
    Abstract: A magnetic read apparatus includes a first sensor, a shield layer, an insulating layer, a shield structure and a second sensor. The shield layer is between the first sensor and the insulating layer. The shield structure is in the down track direction from the insulating layer. The shield structure includes a magnetic seed structure, a shield pinning structure and a shield reference structure. The magnetic seed structure adjoins the shield pinning structure. The shield pinning structure is between the shield reference structure and the magnetic seed structure. The second sensor includes a free layer and a nonmagnetic spacer layer between the shield reference structure and the free layer. The shield reference structure is between the shield pinning structure and the nonmagnetic spacer layer. The shield pinning structure includes a pinned magnetic moment. The shield reference structure includes another magnetic moment weakly coupled with the pinned magnetic moment.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: October 10, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Shaoping Li, Shihai He, Gerardo A. Bertero, Ming Mao, Yuankai Zheng
  • Patent number: 9741369
    Abstract: A system according to one embodiment includes a magnetic head having a plurality of sensors arranged to simultaneously read at least three immediately adjacent data tracks on a magnetic medium, wherein none of the sensors share more than one lead with any other of the sensors. Such embodiment may be implemented in a magnetic data storage system such as a disk drive system, which may include a magnetic head, a drive mechanism for passing a magnetic medium (e.g., hard disk) over the magnetic head, and a controller electrically coupled to the magnetic head.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: August 22, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sharat Batra, Jonathan D. Coker, Travis R. Oenning
  • Patent number: 9715886
    Abstract: In one general embodiment, an apparatus includes a magnetic head. The magnetic head has a first portion and a second portion, the first portion and the second portion together providing a tape bearing surface. The first portion has two pieces flanking the second portion in an intended direction of tape travel thereacross. The second portion has at least one array of transducers. A longitudinal axis of each of the at least one array is defined between opposite ends thereof. The longitudinal axis of each of the at least one array of transducers is oriented at an angle relative to the line oriented orthogonally to the intended direction of tape travel thereacross, the angle being between 0.2° and about 10°.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: July 25, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9704514
    Abstract: A method according to one embodiment includes lapping an end of a section of a thin film wafer for polishing the end of the section, the section having a plurality of rows of transducers formed on a substrate. A bearing surface slot is formed in the polished end at a location that defines a tape bearing surface extending between the bearing surface slot and portions of the transducers exposed on the polished end. A row is sliced from the section, the row having the polished end and bearing surface slot.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: July 11, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9653098
    Abstract: A tape head module for performing azimuth recording and reading of tape media (e.g., where data bands are disposed at an angle to the direction of media travel) to increase the storage density of tape media. An array of read and/or write elements of the tape head module is oriented along an axis different than those of first and second lateral (e.g., overwrapped) edges of the tape head module. Positioning the first and second lateral edges of the disclosed tape head module to be perpendicular to the direction of tape motion (e.g., so that the tape moves over the first and second lateral edges perpendicularly to the first and second lateral edges) automatically positions the array of read and/or write elements at an azimuth angle (e.g., non-perpendicular angle) to the direction of tape motion. Also disclosed are methods for fabricating such tape head modules and related tape head assemblies.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: May 16, 2017
    Assignee: Oracle International Corporation
    Inventor: Joseph E. Torline
  • Patent number: 9536549
    Abstract: A multi-sensor reader that includes a first sensor that has a sensor stack, which includes a free layer (FL) that has a magnetization that changes according to an external magnetic field. The first sensor also includes a shielding structure that is positioned over the sensor stack. The multi-sensor reader also includes a second sensor stacked over the first sensor. The second sensor includes a sensor stack, which includes a FL that has a magnetization that changes according to the external magnetic field. The multi-sensor reader further includes an isolation layer between the first sensor and the second sensor. A FL-to-FL spacing reduction feature is included in at least one of the isolation layer or the shielding structure.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: January 3, 2017
    Assignee: Seagate Technology LLC
    Inventors: Zhiguo Ge, Victor Sapozhnikov, Shaun E. Mckinlay, Eric W. Singleton, Jae Young Yi, Mohammed Shariat Ullah Patwari
  • Patent number: 9514769
    Abstract: A method for writing a servo pattern to a magnetic tape medium by a write head is described. The write head includes a coil configured to generate a magnetic flux when applying an electric current thereto, and a pole piece structure configured to guide the generated magnetic flux. The method includes moving the magnetic tape medium with its servo band above the two gaps in a direction along the longitudinal extension of the magnetic tape medium, applying a current pulse to the coil, continuing to move the magnetic tape medium, and applying another current pulse to the coil. The magnetic tape medium includes at least one servo band along the longitudinal extension of the tape medium having servo patterns organized in servo frames for supporting to determine positional information.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: December 6, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Giovanni Cherubini, Johan B. C. Engelen, Simeon Furrer, Mark A. Lantz
  • Patent number: 9472210
    Abstract: In one general embodiment, an apparatus includes a magnetic head. The magnetic head has a first portion and a second portion, the first portion and the second portion providing a tape bearing surface. The first portion has an opening at least partially encircling the second portion. The second portion has at least one array of transducers. A longitudinal axis of each of the at least one array of transducers is defined between opposite ends thereof, and is oriented at an angle relative to a line oriented orthogonally to the intended direction of tape travel thereacross, the angle being between 0.2° and about 10°. The second portion has a first edge oriented at a second angle between 0.2° and about 10° relative to the line, and a second edge opposite the first edge, the second edge being oriented at a third angle between 0.2° and about 10° relative to the line.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: October 18, 2016
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9449628
    Abstract: In one general embodiment, an apparatus includes a magnetic head. The magnetic head has a first array of data transducers, a second array of data transducers spaced from the first array, and a third array of data transducers positioned between the first and second arrays. The magnetic head is positionable between a first position and a second position, where the longitudinal axis of the third array is positively or negatively angled relative to a line oriented perpendicular to an intended direction of tape travel thereacross when positioned towards the respective positions. Outer data transducers of the third array are about aligned with outer data transducers of the second array when the magnetic head is positioned towards the first position. The outer data transducers of the third array are about aligned with outer data transducers of the first array when the magnetic head is positioned towards the second position.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: September 20, 2016
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9449622
    Abstract: An apparatus according to one embodiment includes a magnetic head having multiple magnetic transducers, the transducers including read sensors. The read sensors are of at least two differing types selected from a group consisting of tunneling magnetoresistance (TMR), giant magnetoresistance (GMR), anisotropic magnetoresistance (AMR), and inductive sensors.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: September 20, 2016
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Peter VanderSalm Koeppe, Calvin S. Lo
  • Patent number: 9443539
    Abstract: A write head for writing a servo pattern to a magnetic tape medium includes a first coil configured to generate a first magnetic flux when applying an electric current to the first coil, a second coil configured to generate a second magnetic flux when applying an electric current to the second coil, and a pole piece structure configured to guide the generated magnetic flux. The pole piece includes a first ring structure for guiding the first magnetic flux, a second ring structure for guiding the second magnetic flux, and a common section of the first and the second ring structure which common section is arranged between the first coil and the second coil. The write head further includes a section containing a gap in each of the first ring structure and the second ring structure. The magnetic flux is oriented in opposite directions across the two gaps.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: September 13, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Giovanni Cherubini, Johan B. C. Engelen, Simeon Furrer, Mark A. Lantz
  • Patent number: 9418682
    Abstract: An apparatus according to one embodiment includes a magnetic head having, on one module thereof, an array of N first data transducers positioned towards a media facing surface of the module, and M second data transducers interleaved with the array of first transducers. Only some of the data transducers are coupled to pads. An apparatus according to another embodiment includes a magnetic head having, on one module thereof, an array of data transducers positioned towards a media facing surface of the module, the data transducers including at least one of data readers, data writers, and combinations thereof. A plurality of pads are on the module, but less than all of the first and/or second data transducers are coupled to pads.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: August 16, 2016
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Kevin T. Luong
  • Patent number: 9396744
    Abstract: A magnetic read head configured for two dimensional magnetic recording and having asymmetrical secondary read elements. The magnetic read head includes a primary read element configured to read a data track (i.e. n data track) and first and second secondary read elements located over adjacent data tracks (i.e. n+1, n?1 data track) at either side of the data track to be read. The secondary read element have asymmetrical off track amplitude profiles, preferably such that they each have a steep amplitude profile at the outer side and a broader cross-track amplitude profile at their inner sides. This allows the secondary read elements to detect signals of the adjacent data track (so that those signals can be subtracted out of the signal from the primary reader) without the secondary read elements also picking up further adjacent data tracks (i.e. n+2, n?2).
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: July 19, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Masato Yamashita, Hiroyuki Katada, Jun Aoyama, Masato Shiimoto
  • Patent number: 9280988
    Abstract: A tape head having offset transducer spans between adjacent modules of the tape head that serves to maintain the balance between debris removal and reduced magnetic layer/recording device spacing on the one hand and reduced tape/tape head friction on the other hand. In one aspect, opposite edges of each module are relatively sharper adjacent the transducer span and relatively rounded (e.g., less sharp) away from the transducer span. The sharp edges reduce magnetic spacing loss and scrape debris off of the tape while the rounded edges reduce or eliminate contact between the tape and the head in regions where no transducer spans are present and thus where no tape writing or reading would be taking place.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: March 8, 2016
    Assignee: Oracle International Corporation
    Inventors: Anand V. Lakshmikumaran, Joseph E. Torline
  • Patent number: 9218838
    Abstract: Aspects of the present invention relates generally to apparatuses with transducer arrays having offset transducers. Various embodiments are particularly suited to tilting for tape dimensional instability compensation. Some embodiments include dual servo readers in a given array.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: December 22, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9208809
    Abstract: In one general embodiment, an apparatus includes at least two modules, each of the modules having an array of transducers, wherein the at least two modules are fixed relative to each other, wherein an axis of each array is defined between opposite ends thereof, wherein the axes of the arrays are oriented about parallel to each other, wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in an intended direction of tape travel thereacross; and a mechanism for orienting the modules about an axis orthogonal to the plane in which the arrays reside to control a transducer pitch presented to a tape.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: December 8, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Philipp Herget, Calvin S. Lo
  • Patent number: 9129631
    Abstract: An apparatus according to one embodiment includes a write transducer and a read transducer. A controller is coupled to the write transducer and the read transducer. The controller is configured to control the write transducer to perform shingled writing where a currently written track is written over a portions of a previously written track thereby defining a shingled track comprising a remaining portion of the previously written track. The controller is also configured to read data from at least one shingled track during the shingled writing. A method according to one embodiment includes writing data in shingled tracks on a magnetic recording medium, performing a read-while-write operation for verifying the data in the shingled tracks, and concurrently reading data from previously shingled tracks.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: September 8, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9129614
    Abstract: An apparatus according to one embodiment includes a magnetic head, the magnetic head having: a tape bearing surface having a first edge oriented perpendicular to an intended direction of tape travel thereacross; and an array of transducers in and/or adjacent the tape bearing surface, wherein a longitudinal axis of the array is defined between opposite ends thereof, wherein the longitudinal axis of the array of transducers is oriented at an angle relative to the first edge, the angle being between greater than 0.2° and about 10°.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: September 8, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 9093119
    Abstract: A method for enhancing read performance in an ARMR system includes: obtaining CTS information for a plurality of readers in a multi-reader head of the ARMR system, the CTS information defining a relationship between skew angle and CTS between respective combinations of subsets of the readers; determining, as a function of the CTS information, a given one of the combinations of subsets of the readers which provides enhanced read performance among a total number of combinations of subsets of the readers for each of a plurality of skew angles; and selecting, for subsequent processing by a read channel in the ARMR system, the given one of the combinations of subsets of the readers determined to provide enhanced read performance for a given one of the skew angles corresponding to a zone in which the multi-reader head is operating.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: July 28, 2015
    Assignee: LSI Corporation
    Inventors: Eui Seok Hwang, George Mathew
  • Patent number: 9053718
    Abstract: A method for forming a protective overcoat onto a tape bearing surface of a tape head used for magnetic tape recording. In order to ensure optimal surface tension and liftoff properties of the ink mask, the tape bearing surface is treated with a first application of ethanol, followed by an application of polydimethylsiloxane, followed by a second application of ethanol. After this treatment an ink mask can be printed onto the tape bearing surface so as to form a mask having an opening over the location of the magnetic transducer. An etching can then be performed followed by the deposition of a protective coating such as alumina.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: June 9, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Que Adrong, Cherngye Hwang, Dung T. Nguyen, Eduardo Torres Mireles
  • Patent number: 9036296
    Abstract: A system according to one embodiment includes at least two write transducers for writing to a magnetic medium; and a low reluctance path from a first pole of a first of the write transducers to a second pole of a second of the write transducers. In another embodiment, either 1) the first pole of the first write transducer and the second pole of the second write transducer are positioned close enough to each other that a low reluctance path is present from the first pole of the first write transducer to the second pole of the second write transducer, or 2) a magnetic strap extends between the first pole of the first write transducer and the second pole of the second write transducer thereby creating a low reluctance path therebetween.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: May 19, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Philipp Herget
  • Patent number: 9036300
    Abstract: A magnetic recording tape according to one embodiment includes at least about eight data bands, wherein each data band is defined between a pair of adjacent servo tracks, each pair of adjacent servo tracks defining only a single data band therebetween. One of the servo tracks has data encoded therein, the data including data for encryption. A magnetic recording tape according to another embodiment includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars. An average height of the bars is less than about 50 microns. About eight to about twenty six data bands are present on the tape. A tape supply cartridge according to various embodiments has a magnetic recording tape as described herein.
    Type: Grant
    Filed: May 21, 2013
    Date of Patent: May 19, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert Glenn Biskeborn, Wayne Isami Imaino
  • Patent number: 9036297
    Abstract: A magnetic head according to one embodiment includes a module, the module having first and second transducers of different transducer types positioned towards a media facing side of the module, wherein the different transducer types are selected from a group consisting of data reader transducers, servo reader transducers, write transducers, piggyback read-write transducers and merged read-write transducers; a first protection structure for protecting the first transducer; and wherein the second transducer has either no protection or is protected by a second protection structure that is different than the first protection structure.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: May 19, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czarnecki, Philipp Herget, Calvin S. Lo
  • Patent number: 9015927
    Abstract: A method for fabricating a synthetic antiferromagnetic device, includes depositing a reference layer on a first tantalum layer and including depositing a first cobalt iron boron layer, depositing a second cobalt iron boron layer on the first cobalt iron boron layer, depositing a second Ta layer on the second cobalt iron boron layer, depositing a magnesium oxide spacer layer on the reference layer and depositing a cap layer on the magnesium oxide spacer layer.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: April 28, 2015
    Assignee: International Business Machines Corporation
    Inventors: David W. Abraham, Michael C. Gaidis
  • Patent number: 9001463
    Abstract: A magnetic head according to one embodiment includes a module, the module having both read and write transducers positioned towards a media facing side of the module, wherein the read and write transducers are selected from a group consisting of piggyback read-write transducers, merged read-write transducers, interleaved read and write transducers, and an array of write transducers flanked by servo read transducers; wherein the write transducers include write poles having media facing sides with negative, zero or near-zero recession from a plane extending along the media facing side of a substrate of the module; wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is more recessed from the plane than the write poles.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: April 7, 2015
    Assignee: International Business Machines Corporaton
    Inventors: Robert G. Biskeborn, Jason Liang, Calvin S. Lo, Andrew C. Ting
  • Patent number: 8995095
    Abstract: In one general embodiment, a magnetic head includes an inner module comprising an array of data writers; and first and second outer modules flanking the inner module. The outer modules are identical, each outer module comprising an array of data readers. A number of active data readers in each outer module is less than a number of active data writers in the inner module. For the first outer module, one of the active data readers is aliened with one of the data writers positioned towards a first end of the inner module array in the direction generally parallel to the path of tape travel thereacross. For the second outer module, one of the active data readers is aligned with one of the data writers positioned towards a second end of the inner module array in the direction generally parallel to the path of tape travel thereacross.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: March 31, 2015
    Assignee: International Business Machines Corporation
    Inventor: Peter VanderSalm Koeppe