Disk Patents (Class 360/135)
-
Patent number: 9691817Abstract: A method of forming a line of magnetic tunnel junctions includes forming magnetic recording material over a substrate, non-magnetic material over the recording material, and magnetic reference material over the non-magnetic material. The substrate has alternating outer regions of reactant source material and insulator material along at least one cross-section. The reference material is patterned into a longitudinally elongated line passing over the alternating outer regions. The recording material is subjected to a set of temperature and pressure conditions to react with the reactant of the reactant source material to form regions of the dielectric material which longitudinally alternate with the recording material along the line and to form magnetic tunnel junctions along the line which individually comprise the recording material, the non-magnetic material, and the reference material that are longitudinally between the dielectric material regions.Type: GrantFiled: January 6, 2016Date of Patent: June 27, 2017Assignee: Micron Technology, Inc.Inventor: Gurtej S. Sandhu
-
Patent number: 9684467Abstract: Methods, systems, and programs are presented for managing a storage device memory. One method includes an operation for receiving a request to pin a volume stored in the storage device. The device includes disk storage and a solid state drive (SSD) cache, where pinned volumes in the storage device have all active volume data in the SSD cache. Further, the method includes an operation for determining the maximum amount of pinnable space in the SSD cache, the maximum amount of pinnable space being calculated based on the sizes of the disk storage and the SSD cache. Further, the method includes operations for determining the available pinning space, which is the maximum amount of pinnable space minus the current amount of pinned data in the SSD cache, and for granting the request to pin the volume when the available pinning space is greater than or equal to a size of the volume.Type: GrantFiled: July 29, 2015Date of Patent: June 20, 2017Assignee: Nimble Storage, Inc.Inventors: Senthil Kumar Ramamoorthy, Pradeep Shetty, Mukul Kumar Singh, Hy Vu
-
Patent number: 9672862Abstract: According to embodiments of the present invention, a method of writing servo information on a storage medium is provided. The method includes applying heat to a servo portion of a storage medium, and applying a magnetic field to the servo portion that is heated to write servo information on the servo portion. According to further embodiments of the present invention, an arrangement for writing servo information on a storage medium and a method of forming a storage medium are also provided.Type: GrantFiled: September 17, 2014Date of Patent: June 6, 2017Assignee: Marvell International Ltd.Inventors: Wen Huei Jack Tsai, Siang Huei Leong, Baoxi Xu
-
Patent number: 9653532Abstract: An on-chip magnetic structure structure includes a magnetic material comprising cobalt in a range from about 80 to about 90 atomic % (at. %) based on the total number of atoms of the magnetic material, tungsten in a range from about 4 to about 9 at. % based on the total number of atoms of the magnetic material, phosphorous in a range from about 7 to about 15 at. % based on the total number of atoms of the magnetic material, and palladium substantially dispersed throughout the magnetic material.Type: GrantFiled: July 30, 2016Date of Patent: May 16, 2017Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Hariklia Deligianni, William J. Gallagher, Andrew J. Kellock, Eugene J. O'Sullivan, Lubomyr T. Romankiw, Naigang Wang
-
Patent number: 9607645Abstract: A magnetic recording device includes: a magnetic recording medium containing a plurality of recording layers; a magnetic recording head for conducting magnetic writing of information in the magnetic recording medium; and a magnetic reproducing head for conducting magnetic reading out of the information from the magnetic recording medium; wherein the magnetic recording head includes a high frequency oscillator for magnetically assisting the magnetic writing of the information so as to change a magnetization of at least one of the plurality of recording layers of the magnetic recording medium, thereby recording a plurality of information different from one another in the magnetic recording medium commensurate with a total amount of magnetization of the plurality of recording layers.Type: GrantFiled: March 9, 2015Date of Patent: March 28, 2017Assignee: Kabushiki Kaisha ToshibaInventors: Hideaki Fukuzawa, Hiromi Yuasa
-
Patent number: 9595361Abstract: A thin film structure includes a metal seed layer, and a method of forming an oxide thin film on a conductive substrate by using the metal seed layer is disclosed. The thin film structure includes a transparent conductive substrate, a metal seed layer that is deposited on the transparent conductive substrate, and a metal oxide layer that is deposited on the metal seed layer.Type: GrantFiled: July 22, 2014Date of Patent: March 14, 2017Assignee: Samsung Electronics Co., Ltd.Inventors: Hyeon-jin Shin, Seong-jun Park, Jae-ho Lee, Seong-Jun Jeong
-
Patent number: 9595282Abstract: According to one embodiment, a magnetic medium includes a substrate, and a magnetic recording layer positioned above the substrate, the magnetic recording layer including an ordered alloy having a L10-type structure, where the ordered alloy comprises a plurality of ferromagnetic crystal grains surrounded by non-magnetic grain boundaries, and where the ordered alloy comprises Fe, Ni and Pt.Type: GrantFiled: January 28, 2015Date of Patent: March 14, 2017Assignee: HGST Netherlands B.V.Inventors: Junichi Sayama, Yoshiyuki Hirayama
-
Patent number: 9548076Abstract: A magnetic device including a magnetic writer; and an overcoat positioned over at least the magnetic writer, the overcoat including oxides of yttrium, oxides of scandium, oxides of lanthanoids, oxides of actionoids, oxides of zinc, or combinations thereof.Type: GrantFiled: November 3, 2014Date of Patent: January 17, 2017Assignee: Seagate Technology LLCInventors: Xiaoyue Huang, Seung-Yeul Yang, Steve Riemer, Michael C. Kautzky
-
Patent number: 9410260Abstract: A method of forming a nano-structure involves forming a multi-layered structure including an oxidizable material layer established on a substrate, and another oxidizable material layer established on the oxidizable material layer. The oxidizable material layer is an oxidizable material having an expansion coefficient, during oxidation, that is more than 1. Anodizing the other oxidizable material layer forms a porous anodic structure, and anodizing the oxidizable material layer forms a dense oxidized layer and nano-pillars which grow through the porous anodic structure into pores thereof. The porous structure is selectively removed to expose the nano-pillars. A surface (I) between the dense oxidized layer and a remaining portion of the oxidizable material layer is anodized to consume a substantially cone-shaped portion of the nano-pillars to form cylindrical nano-pillars.Type: GrantFiled: October 21, 2010Date of Patent: August 9, 2016Assignee: Hewlett-Packard Development Company, L.P.Inventors: Peter Mardilovich, Qingqiao Wei, Anthony M. Fuller
-
Patent number: 9368131Abstract: A data storage device is disclosed wherein when a first head is over a top disk surface, a first undershoot of a first cross-track profile is closer to an inner diameter of a disk and a second undershoot of the first cross-track profile is closer to an outer diameter of the disk. When a second head is over a bottom disk surface, a second undershoot of a second cross-track profile is closer to the inner diameter of the disk and a first undershoot of the second cross-track profile is closer to the outer diameter of the disk.Type: GrantFiled: April 3, 2015Date of Patent: June 14, 2016Assignee: Western Digital (Fremont), LLCInventors: Kathy X. Tang, Xiao Z. Wu, Hong Pan
-
Patent number: 9343144Abstract: According to one embodiment, a memory device includes a plurality of global column lines arranged in parallel and extending in a first direction; a plurality of row lines extending in a second direction which is perpendicular to the first direction; a plurality of column lines in a two-dimensional arrangement, which extend in a third direction which is perpendicular to the first direction and the second direction; and a memory cell array including a plurality of memory cells arranged at intersections between the row lines and the column lines.Type: GrantFiled: July 27, 2015Date of Patent: May 17, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventor: Kenichi Murooka
-
Patent number: 9252020Abstract: Proposed are a composite material having a high adhesiveness, wherein non-penetrating pores that are formed in a silicone surface layer are filled up with a metal or the like without leaving any voids by using the plating technique and the silicone surface layer is coated with the metal or the like, and a method of producing the composite material. A composite material, which has a high adhesiveness between a second metal or an alloy of the second metal (106a, 106b) and a silicone surface, can be obtained by filling up non-penetrating pores that are formed in the surface of a silicone substrate (100) substantially with a second metal or an alloy of the second metal (106a) with the use of the autocatalytic electroless plating technique wherein a first metal located at the bottom of the non-penetrating pores as described above serves as the starting point, and coating the surface of the silicone substrate (100) with the second metal (106b).Type: GrantFiled: May 1, 2013Date of Patent: February 2, 2016Assignee: Japan Science and Technology AgencyInventors: Shinji Yae, Tatsuya Hirano, Hitoshi Matsuda
-
Patent number: 9165571Abstract: A data storage system may be configured at least with a seed lamination that is disposed between a magnetic stack and a magnetic shield. The seed lamination may be constructed and operated with a coupling buffer layer and a seed layer with the coupling buffer layer fabricated of an alloy of cobalt and a transition metal.Type: GrantFiled: November 11, 2013Date of Patent: October 20, 2015Assignee: Seagate Technology LLCInventors: Gabriel G. McCafferty, Sameh Sayed Ali Hassan, Marcus Ormston, Kevin A. McNeill
-
Patent number: 9117472Abstract: Systems, methods, and other embodiments associated with processing a read signal from a storage medium that includes continuous embedded position information are described. According to one embodiment, an apparatus includes read logic configured to control a storage device to generate the read signal by reading a first layer and a second layer of the storage medium. The first layer defines data and the second layer defines embedded position information. The apparatus includes data detection logic configured to process the read signal to recover the embedded position information. The read logic is configured to control the storage device based, at least in part, on the embedded position information.Type: GrantFiled: February 27, 2014Date of Patent: August 25, 2015Assignee: MARVELL INTERNATIONAL LTD.Inventors: Qiyue Zou, Michael Madden, Gregory Burd
-
Patent number: 9111565Abstract: Embodiments of a single data storage device with multiple different data recording media surfaces are disclosed. In one embodiment, at least one of the data recording media surfaces is conventional, such as a continuous or discrete track recording media. Another of the data recording media surfaces is a relatively high areal density, high data rate recording media, such as a bit patterned media (BPM) recording media.Type: GrantFiled: January 16, 2009Date of Patent: August 18, 2015Assignee: Seagate Technology LLCInventors: Kaizhong Gao, Olle Heinonen, Wenzhong Zhu
-
Patent number: 9047906Abstract: The embodiments disclose a dual-layer magnetic recording structure including a top magnetic layer etched to remove patterned portions of the top magnetic layer and a bottom magnetic layer including portions with altered magnetic properties of molecules to reduce net magnetic moments and including portions of unaltered magnetic properties exchange-coupled through the top magnetic layer.Type: GrantFiled: September 28, 2012Date of Patent: June 2, 2015Assignee: Seagate Technology, LLCInventor: Zhaohui Fan
-
Patent number: 9042053Abstract: A magnetic recording medium including a substrate, and at least one magnetic layer formed on the substrate. The magnetic layer is formed from an alloy containing Cobalt, and Platinum (Pt). The magnetic layer is also formed from grain boundary segregation materials comprising Manganese Oxide and at least one of Silicon Oxide, Chromium Oxide, and Cobalt Oxide (CoO).Type: GrantFiled: June 24, 2014Date of Patent: May 26, 2015Assignee: WD Media, LLCInventors: Yang Yang, Iwao Okamoto
-
Patent number: 9036289Abstract: A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within nanotubes (e.g., carbon nanotubes).Type: GrantFiled: August 1, 2014Date of Patent: May 19, 2015Assignee: Sigma Pro Ltd. LLCInventor: Tyson York Winarski
-
Publication number: 20150116690Abstract: A method is disclosed that includes forming at least one substrate alignment mark and at least one lithography alignment mark in a substrate; forming a seed layer on the substrate; and forming a guide pattern and at least one guide pattern alignment mark in the seed layer, where the at least one guide pattern alignment mark is formed over the at least one substrate alignment mark. The method further includes determining an alignment error of the at least one guide pattern alignment mark relative to the at least one substrate alignment mark; and patterning features on at least one region of the substrate, where the features are positioned on the substrate based on the at least one lithography alignment mark and the alignment error.Type: ApplicationFiled: October 31, 2013Publication date: April 30, 2015Applicant: SEAGATE TECHNOLOGY LLCInventors: HongYing Wang, Kim Y Lee, Yautzong Hsu, Nobuo Kurataka, Gennady Gauzner, Shuaigang Xiao
-
Publication number: 20150109703Abstract: A magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate. The representative structure of the magnetic disk substrate is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.Type: ApplicationFiled: November 24, 2014Publication date: April 23, 2015Applicants: HOYA GLASS DISK (Thailand) LTD., HOYA CORPORATIONInventors: Toshio TAKIZAWA, Kraisorn PHANDON, Kenichi NISHIMORE
-
Patent number: 9013832Abstract: A perpendicular magnetic recording medium includes a nonmagnetic substrate, an underlayer provided above the nonmagnetic substrate, and a perpendicular recording layer provided above the underlayer. The perpendicular recording layer includes a first magnetic layer including Co and Pt and having a granular structure, and a second magnetic layer having magnetic and ferroelectric properties.Type: GrantFiled: June 6, 2014Date of Patent: April 21, 2015Assignee: Showa Denko K.K.Inventors: Akira Sakawaki, Akira Yamane
-
Patent number: 9007880Abstract: A thermally assisted magnetic recording medium (1) includes a substrate (101), an underlayer (3) that is formed above the substrate (101), and a magnetic layer (107) that is formed on the underlayer (3) and contains an alloy having an L10 structure as a main component. The underlayer (3) is formed by continuously laminating a first underlayer (104) having a BCC structure with a lattice constant that is 0.302 to 0.332 nm, a second underlayer (105) that has a NaCl structure including C, and a third underlayer (106) that is composed of MgO.Type: GrantFiled: April 30, 2013Date of Patent: April 14, 2015Assignee: Showa Denko K.K.Inventors: Tetsuya Kanbe, Kazuya Niwa, Yuji Murakami, Lei Zhang
-
Patent number: 9007878Abstract: An aspect of the present invention relates to glass for a magnetic recording medium substrate, which includes essential components in the form of SiO2, Li2O, Na2O, and one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO, and BaO, wherein a molar ratio of a content of MgO to a combined content of MgO, CaO, SrO, and BaO (MgO/(MgO+CaO+SrO+BaO)) is equal to or greater than 0.80, and which has a Young's modulus of equal to or greater than 80 GPa, and a glass transition temperature of equal to or greater than 620° C.Type: GrantFiled: July 25, 2014Date of Patent: April 14, 2015Assignee: Hoya CorporationInventors: Naomi Matsumoto, Kazuaki Hashimoto
-
Patent number: 9005781Abstract: A perpendicular recording medium having a perpendicular magnetic recording layer and a magnetically soft underlayer structure disposed beneath the recording layer. The soft underlayer structure includes at least first and second soft magnetic layers having different magnetic permeabilities to create a magnetic permeability gradient in the soft underlayer structure. One or more of the soft magnetic layers can be antiparallel coupled. The soft underlayer structure of the present invention having a magnetic permeability gradient advantageously leads to reduced adjacent track erasure (ATE) while maintaining good overwrite (OW) properties.Type: GrantFiled: September 14, 2012Date of Patent: April 14, 2015Assignee: Seagate Technology LLCInventors: Jianing Zhou, B. Ramamurthy Acharya, E. Noel Abarra, Gunn Choe
-
Patent number: 8995089Abstract: According to one embodiment, there is provided a magnetic recording medium which includes a base, a magnetic recording layer having convex-shaped magnetic layers, which is formed on the base, and a protective film formed on the magnetic recording layer. There are gaps in a region surrounded by the protective film, the surface of the base, and each side wall of each magnetic layer.Type: GrantFiled: July 17, 2013Date of Patent: March 31, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Kazutaka Takizawa, Akira Watanabe, Kaori Kimura, Tsuyoshi Onitsuka, Takeshi Iwasaki, Masahiro Takashita, Akihiko Takeo
-
Publication number: 20150085401Abstract: An HDD includes a magnetic head, and a magnetic recording medium. The recording medium includes a recording magnetic layer, and a recording assist magnetic layer, the recording assist magnetic layer generates a high-frequency magnetic field by means of a recording field from the magnetic head, and a recording assist action acts on the recording magnetic layer.Type: ApplicationFiled: September 26, 2013Publication date: March 26, 2015Applicant: HGST Netherlands B.V.Inventors: Hiroaki Nemoto, Ichiro Tamai, Tatsuya Hinoue, Yuzuru Hosoe
-
Patent number: 8988828Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L10 type crystal structure, and a plurality of underlayers arranged between the substrate and the magnetic layer. At least one of the plurality of underlayers is a soft magnetic underlayer formed by an alloy having a hexagonal close packed (hcp) structure and including Co metal or Co as its main component, with a (11•0) plane oriented parallel to a surface of the substrate.Type: GrantFiled: June 27, 2014Date of Patent: March 24, 2015Assignee: Showa Denko K.K.Inventors: Tetsuya Kanbe, Kazuya Niwa, Yuji Murakami, Lei Zhang
-
Patent number: 8986859Abstract: It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate. The representative structure of a magnetic disk substrate is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.Type: GrantFiled: July 9, 2012Date of Patent: March 24, 2015Assignees: Hoya Corporation, Hoya Glass Disk (Thailand) Ltd.Inventors: Toshio Takizawa, Kraisorn Phandon, Kenichi Nishimori
-
Patent number: 8982510Abstract: Perpendicular magnetic recording disks and methods of fabricating perpendicular magnetic recording disks are described. The perpendicular magnetic recording disk includes a soft magnetic underlayer (SUL) structure, an interlayer, and a perpendicular magnetic recording layer. The SUL structure has an increased permeability from an inner radius of the disk to an outer radius of the disk. As a result, the magnetic write width (MWW) on the tracks of the disk is substantially uniform throughout the disk.Type: GrantFiled: November 5, 2007Date of Patent: March 17, 2015Assignee: HGST Netherlands B.V.Inventor: Gunn Choe
-
Patent number: 8977816Abstract: A cache and disk management method is provided. In the cache and disk management method, a command to delete all valid data stored in a cache, or specific data corresponding to a part of the valid data may be transmitted to a plurality of member disks. That is, all of the valid data or the specific data may exist in the cache only, and may be deleted from the plurality of member disks. Accordingly, the plurality of member disks may secure more space, an internal copy overhead may be reduced, and more particularly, solid state disks may achieve better performance.Type: GrantFiled: December 23, 2009Date of Patent: March 10, 2015Assignee: OCZ Storage Solutions Inc.Inventor: Soo Gil Jeong
-
Perpendicular magnetic recording media with magnetic anisotropy gradient and local exchange coupling
Patent number: 8962164Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.Type: GrantFiled: August 6, 2013Date of Patent: February 24, 2015Assignee: Seagate Technology LLCInventors: Shaoping Li, Kaizhong Gao, Lei Wang, Wenzhong Zhu, Xiaobin Wang -
Patent number: 8958177Abstract: In one embodiment, there are provided: a substrate; a data area disposed on the substrate and having a plurality of first magnetic dots arrayed in lines in mutually different first, second, and third directions; and a boundary magnetic part having a plurality of first magnetic portions arrayed in a line in the third direction and each having a length longer than that of the first magnetic dot in the third direction, and a second magnetic dot disposed between the first magnetic portions and disposed on extensions in the first and second directions of the first magnetic dots, and disposed along with the data area on the substrate.Type: GrantFiled: June 7, 2013Date of Patent: February 17, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Akira Kikitsu, Naoko Kihara, Yoshiyuki Kamata, Hiroyuki Hieda
-
Publication number: 20150043101Abstract: A product, according to one embodiment, includes a magnetic recording tape having opposite ends, a longitudinal axis of the magnetic recording tape being defined between the ends. The magnetic recording tape has at least one servo track, the at least one servo track having a plurality of first magnetic bars and a plurality of third magnetic bars oriented to form chevron-like patterns with the first magnetic bars. The first magnetic bars each have a longitudinal axis oriented at a first angle between 2 and 88 degrees from the longitudinal axis of the magnetic recording tape. The third magnetic bars each have a longitudinal axis oriented at a second angle between 2 and 88 degrees from the longitudinal axis of the magnetic recording tape, the second angle having a different numerical absolute value than the first angle.Type: ApplicationFiled: August 12, 2013Publication date: February 12, 2015Applicant: International Business Machines CorporationInventors: Robert G. Biskeborn, Mark A. Lantz
-
Patent number: 8951652Abstract: A substrate for a magnetic recording medium having a disc shape with a central hole is provided in which the surface roughness of the principal surface of the substrate is 1 angstrom or less in terms of root mean square roughness (Rq) when a space period (L) of an undulation in the circumferential direction is in the range 10 to 1,000 ?m, and in which when a component in the vertical axis direction of a line segment Z connecting a point A with the space period (L) of 10 ?m and a point B with the space period (L) of 1,000 ?m in a curve S marked on a double logarithmic graph which is obtained by analyzing the surface roughness using a spectrum and in which the horizontal axis is set to the space period (L) (?m) and the vertical axis is set to the power spectrum density (PSD) (k·angstrom2·?m) (where k is a constant) is defined as H and a displacement at which the component in the vertical axis direction of the curve S is the maximum with respect to the line segment Z is defined as ?H, a value (P) expressed by (?Type: GrantFiled: November 28, 2012Date of Patent: February 10, 2015Assignee: Showa Denko K.K.Inventors: Koji Yukimatsu, Yukihisa Matsumura, Yoshihito Sueoka, Junichi Kishimoto
-
Publication number: 20150036243Abstract: A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.Type: ApplicationFiled: July 30, 2014Publication date: February 5, 2015Inventors: Ken INOUE, Kenji SHIMIZU, Gohei KUROKAWA, Haruhisa OHASHI
-
Publication number: 20150036242Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having a L10 type crystal structure as a main component thereof, and a plurality of underlayers arranged between the substrate and the magnetic layer. The plurality of underlayers include a first underlayer including two or more elements selected from a group consisting of Ta, Nb, Ti, and V, and one or more elements selected from a group consisting of W and Mo, and a second underlayer including MgO.Type: ApplicationFiled: July 17, 2014Publication date: February 5, 2015Inventors: Lei ZHANG, Tetsuya KANBE, Yuji MURAKAMI, Kazuya NIWA
-
Patent number: 8945364Abstract: A patterned magnetic recording medium, accessible by a magnetic recording head, including a plurality of tracks, a width direction of each track and that of the magnetic recording head being of a skew angle. The patterned magnetic recording medium includes a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material. The plurality of magnetic dots are arranged in a plurality of arrays, each array corresponding to one of the tracks. Every N adjacent magnetic dots of the array define a polygon, one side thereof being parallel to the corresponding track, and another side thereof being parallel to a direction corresponding to the skew angle of the corresponding track.Type: GrantFiled: November 15, 2010Date of Patent: February 3, 2015Assignee: Fuji Electric Co., Ltd.Inventor: Shinji Uchida
-
Patent number: 8947987Abstract: Aspects of the present invention are directed to heat assisted magnetic recording (HAMR) media with a CoCrPtB based capping layer design that is capable of reducing switching field distribution and boosting signal-to-noise ratio of HAMR media. In one embodiment of the invention, a recording medium for heat assisted magnetic recording (HAMR) includes a substrate, a magnetic recording layer on the substrate, and a capping layer on and directly in contact with the magnetic recording layer. The capping layer includes CoCrPtB.Type: GrantFiled: July 1, 2013Date of Patent: February 3, 2015Assignee: WD Media, LLCInventors: Bincheng Wang, Alexander S. Chernyshov, Hua Yuan, Tomoko Seki, Antony Ajan, B. Ramamurthy Acharya
-
Patent number: 8941950Abstract: Various embodiments provide for a heat assisted magnetic recording (HAMR) media comprising: a magnetic recording layer; a barrier layer disposed under the magnetic recording layer; a first underlayer disposed under the barrier layer; and an amorphous seedlayer disposed under the first underlayer. For some embodiments, the recording medium may comprise: a magnetic recording layer including FePt alloy, a CoPt alloy, or a FePd alloy; a barrier layer including MgO, TiC, TiN, CrN, TiCN, ?-WC, TaC, HfC, ZrC, VC, NbC, or NiO; a first underlayer including RuAl-oxide, NiAl, FeAl, AlMn, CuBe, or AlRe; or an amorphous seedlayer including a Cr—X alloy, where X comprises Al, B, C, Cu, Hf, Ho, Mn, Mo, Ni, Ta, Ti, V, W, or Ru.Type: GrantFiled: May 23, 2012Date of Patent: January 27, 2015Assignee: WD Media, LLCInventors: Hua Yuan, Antony Ajan, Alexander S. Chernyshov, B. Ramamurthy Acharya
-
Patent number: 8929008Abstract: Systems and methods for testing magnetic media disks during manufacturing using sliders with temperature sensors are provided. One such method involves scanning a surface of a selected disk of a plurality of magnetic media disks using a slider including a magnetic transducer and a temperature sensor, counting a number of the surfaces scanned, determining, during the scanning, whether a threshold crossing event has occurred by determining whether a signal from the temperature sensor signal is not within a preselected range, counting, during the scanning, a number of threshold crossing events, storing, if the number of threshold crossing events is greater than a preselected events limit, the number of surfaces scanned, stopping, if the number of surfaces scanned is greater than a surfaces scanned threshold, the scanning, and returning, if the number of surfaces scanned is less than or equal to the surfaces scanned threshold, to scan a next selected disk.Type: GrantFiled: June 26, 2013Date of Patent: January 6, 2015Assignee: WD Media, LLCInventors: Thomas A. O'Dell, Balvinder Singh
-
Patent number: 8913335Abstract: Shingled magnetic recording (SMR) devices according to embodiments of the invention include unshingled cache regions that can be used for storage of data. The unshingled cache regions can be used in a variety of flexible ways including in an implementation of write-twice caching or for opportunistic temporary storage to improve performance. The cache regions can be offset between top and bottom surfaces of the disk and staggered between disks to provide shorter seek times to the nearest cache region. Embodiments of the invention are adapted for use with symmetric or asymmetric heads.Type: GrantFiled: July 18, 2011Date of Patent: December 16, 2014Assignee: HGST Netherlands B.V.Inventors: Jonathan Darrel Coker, David Robison Hall
-
Patent number: 8908312Abstract: A data storage device and method for enabling dynamic fly height control which is insensitive to off-track motions is described. In some embodiments, a hard disk drive acquires signal data from neighboring overlapping tracks which are unwritten, thermally erased, or AC demagnetized. Side-to-side (off-track) positional errors or oscillations of the read head do not affect the signal which arises solely from the magnetic domains on the disk. Thus, signal variations may only arise from changes in the fly height. In other embodiments, neighboring overlapping data tracks are prewritten with reference data. The width of the neighboring overlapping tracks exceeds any expected side-to-side positional errors of the read head, thus signal variations may only arise from changes in the fly height. For all embodiments, the noise or reference data signal may serve as a reliable dynamic measure of the fly height with no effects arising from off-track motions.Type: GrantFiled: November 19, 2012Date of Patent: December 9, 2014Assignee: HGST Netherlands B.V.Inventors: Sripathi V. Canchi, Michael K. Grobis, Bruno Marchon, Erhard Schreck
-
Patent number: 8908309Abstract: A system, method, and apparatus for forming a high quality master pattern for patterned media, including features to support servo patterns, is disclosed. Block copolymer self-assembly is used to facilitate the formation of a track pattern with narrower tracks. E-beam lithography forms a chemical contrast pattern of concentric rings, where the spacing of the rings is equal to an integral multiple of the target track pitch. The rings include regions within each servo sector header where the rings are offset radially by a fraction of a track pitch. Self-assembly is performed to form a new ring pattern at the target track pitch on top of the chemical contrast pattern, including the radial offsets in the servo sector headers. When this pattern is transferred to disks via nanoimprinting and etching, it creates tracks separated by nonmagnetic grooves, with the grooves and tracks including the radial offset regions.Type: GrantFiled: May 31, 2013Date of Patent: December 9, 2014Assignee: HGST Netherlands B.V.Inventors: Thomas Robert Albrecht, Bruno Marchon, Ricardo Ruiz
-
Patent number: 8902545Abstract: A magnetic recording medium may have a stacked structure including a first soft magnetic layer, an orientation control layer, a lower recording layer, an intermediate layer, and an upper recording layer that are sequentially stacked, and a second soft magnetic layer provided between the lower recording layer and the intermediate layer.Type: GrantFiled: June 18, 2013Date of Patent: December 2, 2014Assignee: Showa Denko K.K.Inventors: Hideaki Takahoshi, Daisuke Amiya, Hiroshi Sakai
-
Patent number: 8895165Abstract: Provided is a method of manufacturing a magnetic disk glass substrate, wherein, in a main surface polishing process, main surface polishing is applied to one of main surfaces of a glass substrate so that the one main surface has a predetermined arithmetic mean roughness, and main surface polishing is applied to the other main surface of the glass substrate so that the other main surface has a roughness which is higher than the arithmetic mean roughness (Ra) of the one main surface and which is low enough to prevent a component forming the magnetic disk glass substrate from being eluted from the other main surface.Type: GrantFiled: September 2, 2009Date of Patent: November 25, 2014Assignees: Hoya Corporation, Hoya Glass Disk (Thailand) Ltd.Inventors: Kenichi Nishimori, Tadashi Tomonaga
-
Patent number: 8896951Abstract: A magnetic disk according to an embodiment includes: a plurality of data regions each including a plurality of tracks, each of the tracks being arranged to extend in a circumferential direction; a servo region provided between the data regions, the servo region extending in a radial direction, the servo region including: a plurality of guide patterns each extending in the radial direction; and at least one line of dots arranged by post patterns in the radial direction at least on a side of one of adjacent guide patterns, the post patterns being arranged in the radial direction between the adjacent guide patterns.Type: GrantFiled: June 29, 2012Date of Patent: November 25, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Okino, Naoko Kihara, Yoshiyuki Kamata
-
Publication number: 20140340790Abstract: An enlarged substrate for a magnetic recording medium used in a data storage device such as a hard disc drive (HDD). In some embodiments, an apparatus includes a substrate for a magnetic recording disc for installation in a 3½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 96.9 mm to 100.4 mm. In other embodiments, an apparatus comprises a substrate for a magnetic recording disc for installation in a 2½ inch form factor hard disc drive, the substrate having an overall diameter of nominally from 66.9 mm to 71.8 mm. In other embodiments, a data storage device has a magnetic recording medium that uses an enlarged substrate as set forth above.Type: ApplicationFiled: October 2, 2013Publication date: November 20, 2014Applicant: Seagate Technologies LLCInventors: Koji Adachi, Ian J. Beresford, Thomas Y. Chang, Kuo Hsing Hwang, Jim P. Hennessy, David Perez
-
Patent number: 8877360Abstract: According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a multilayered magnetic recording layer formed on the substrate by alternately stacking two or more magnetic layers and two or more nonmagnetic layers. The magnetic layers and nonmagnetic layers of the multilayered magnetic recording layer are continuous layers. The magnetic layer includes a magnetic material portion, and a plurality of pinning sites dispersed in the magnetic material portion and made of a nonmagnetic metal different from a nonmagnetic material as a main component of the nonmagnetic layer. This perpendicular magnetic recording medium has magnetic characteristics by which a gradient ? of a magnetization curve near the coercive force is 5 or more.Type: GrantFiled: November 23, 2011Date of Patent: November 4, 2014Assignee: Kabushiki Kaisha ToshibaInventor: Soichi Oikawa
-
Patent number: 8873179Abstract: A bit-patterned media (BPM) magnetic recording disk has two sizes of dots of magnetic material. The large and small dots are formed together in a hexagonal-close-packed (HCP) pattern. In the data regions none of the larger sized dots are adjacent one another; however in the servo regions some of the larger sized dots are adjacent one another. The adjacent larger sized dots form blocks that provide large amplitude “bursts” as the readback signal, as required for servo burst fields. The disk is made by imprint lithography using an imprint template, which can be made by directed self-assembly (DSA) of a block copolymer (BCP). The imprint template has two sizes of recesses, resulting in BPM disks with two sizes of dots. After the disks are imprinted they are exposed to a DC magnetic field, which magnetizes all the dots in the same direction.Type: GrantFiled: September 12, 2013Date of Patent: October 28, 2014Assignee: HGST Netherlands B.V.Inventors: Yoshiyuki Hirayama, Taku Iwase
-
Patent number: 8867171Abstract: A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.Type: GrantFiled: November 21, 2012Date of Patent: October 21, 2014Assignee: Agency for Science, Technology and ResearchInventors: Zhimin Yuan, Bo Liu, Jiangzhong Shi, Weidong Zhou