Laminated Patents (Class 360/125.12)
  • Patent number: 10607638
    Abstract: According to one embodiment, a magnetic head includes a reproducing portion. The reproducing portion includes first to fourth magnetic portions and a stacked body. The third magnetic portion is provided between the first and second magnetic portions. The fourth magnetic portion is provided between the first and second magnetic portions. A second direction from the third magnetic portion toward the fourth magnetic portion crosses a first direction from the first magnetic portion toward the second magnetic portion. The stacked body is provided between the first and second magnetic portions in the first direction and between the third and fourth magnetic portions in the second direction. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic portion in the first direction, and an intermediate layer provided between the first and second magnetic layers in the first direction.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: March 31, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Michinaga Yamagishi, Tazumi Nagasawa
  • Patent number: 9818438
    Abstract: A system may compensate for skew in a patterned medium, such as but not limited to a self-assembling bit patterned medium, with a write pole separated from a data storage medium by an air bearing. The write pole being connected to a controller. The data storage medium can have a plurality of magnetic islands arranged in data tracks with each data track having a track center. The write pole may be selectively shifted from the track center by the controller to compensate for a skewed write pole configuration.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: November 14, 2017
    Assignee: Seagate Technology LLC
    Inventors: Wenzhong Zhu, Gary E. Hillukka, Bin Huang
  • Patent number: 9711168
    Abstract: A method provides magnetic write apparatus. A side shield location layer having a location corresponding to the side shield(s) and back and side surfaces is provided. Part of the back surface corresponds to the back surface of the side shield. A nonmagnetic layer adjoining the back and side surface(s) of the side shield location layer is provided. A pole trench is formed in the layers using a first etch process. The nonmagnetic and side shield location layers have an etch selectivity of at least 0.9 and not more than 1.1 for the first etch. A pole is provided in the pole trench. A remaining portion of the side shield location layer is removed using a wet etch. The nonmagnetic layer is nonremovable by the wet etch. Side shield(s) having a back surface substantially the same as the back surface of the side shield location layer are provided.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: July 18, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Xiaoyu Yang, Jinqiu Zhang, Feng Liu, Xiaotian Zhou, Hai Sun, Ming Jiang
  • Patent number: 9595274
    Abstract: Various methods for attaching a crystalline write pole onto an amorphous substrate and the resulting structures are described in detail herein. Further, the resulting structure may have a magnetic moment exceeding 2.4 Tesla. Still further, methods for depositing an epitaxial crystalline write pole on a crystalline seed or template material to ensure that the phase of the write pole is consistent with the high moment phase of the template material are also described in detail herein.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: March 14, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Mark Anthony Gubbins, Marcus Benedict Mooney
  • Patent number: 9218825
    Abstract: A magnetic element may be generally configured with at least a write pole that has leading and trailing regions on an air bearing surface. The leading region may have a trailing width connected to a leading width of the trailing region via a transition feature to form a substantially T-shaped cross-section on the air bearing surface.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: December 22, 2015
    Assignee: Seagate Technology LLC
    Inventors: Jianhua Xue, Zhe Shen, Christopher James Rea, Eric Roger Meloche, Huaqing Yin
  • Patent number: 9208361
    Abstract: A magnetic stripe card reader useful for reading magnetic stripe bearing cards having at least one magnetic track, the magnetic stripe reader including a magnetic stripe reader head including multiple magnetic sensors including at least one magnetic track reading sensor for reading data encoded in a magnetic track of a magnetic stripe and at least one magnetic sensor which does not read encoded data, the magnetic stripe reader head providing magnetic sensor outputs including at least one magnetic track sensor reading output and at least one magnetic sensor output which has no encoded data therein and a subtractor operative to subtract at least a portion of the at least one magnetic sensor output, which has no encoded data therein, from the at least one magnetic track sensor reading output having card data encoded thereon, thereby to cancel interference from the at least one magnetic track reading output.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: December 8, 2015
    Assignee: VERIFONE INC.
    Inventors: Jack Richard Grenfell, V Neelakantan, Michael Schmid
  • Patent number: 9129625
    Abstract: A magnetic device including a write pole, a magnetic reader, or both; and one or more shields adjacent at least a portion of the write pole or the magnetic reader, or both, wherein at least a portion of the one or more shields includes or is made from Ni100-aXa, wherein X is chosen from: Ru, Re, Zr, Cr, and Cu; and a is the atomic percent of the element X, and can range from about 20 to about 90.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: September 8, 2015
    Assignee: Seagate Technology LLC
    Inventors: Sarbeswar Sahoo, Edwin Rejda
  • Patent number: 9030776
    Abstract: A magnetic head includes a main pole, a write shield, and first and second nonmagnetic layers. The main pole has a top surface including an inclined surface portion. The inclined surface portion includes a first portion and a second portion, the first portion being closer to a medium facing surface. The write shield includes an inclined portion facing toward the top surface of the main pole. The first nonmagnetic layer is interposed between the inclined portion and the second portion of the inclined surface portion. The second nonmagnetic layer is interposed between the inclined portion and a combination of the first portion of the inclined surface portion and the first nonmagnetic layer.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: May 12, 2015
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Yukinori Ikegawa, Hironori Araki, Tatsuya Shimizu
  • Patent number: 9025280
    Abstract: A perpendicular magnetic recording (PMR) head is fabricated with a multi-level tapered write pole. The write pole comprises a main pole with a tapered tip on a leading edge or a trailing edge, on which is formed at least one yoke that has a tapered edge. The edge of the yoke is recessed from the ABS of the main pole, giving the head a stepped profile. The yoke can be a single yoke formed on one side of the main pole or it can be two yokes formed on both the leading and trailing sides of the main pole. The write pole structure creates an efficient channeling of magnetic flux to the ABS surface of the pole tip which produces magnetic recording field at high area densities.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: May 5, 2015
    Assignee: Headway Technologies, Inc.
    Inventors: Zhigang Bai, Kowang Liu, Yan Wu, Moris Dovek
  • Patent number: 8988826
    Abstract: A microwave-assisted magnetic recording (MAMR) head according to one embodiment includes a main pole; a trailing shield positioned downstream from the main pole; an oscillation device adapted to generate a high-frequency magnetic field, the oscillation device being positioned between the main pole and the trailing shield; a circuit adapted to flow an electric current therethrough to the main pole, the oscillation device, and the trailing shield; an electrically conductive non-magnetic body positioned on one or more sides of the main pole in a cross-track direction and/or a leading direction; and an insulating non-magnetic body positioned on one or more sides of the electrically conductive non-magnetic body in the cross-track direction and/or the leading direction, wherein one or more edge portions of one side of the oscillation device and one or more edge portions of one side of the main pole are in direct contact with the electrically conductive non-magnetic body.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: March 24, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Mikito Sugiyama, Masato Shiimoto, Keiichi Nagasaka
  • Patent number: 8970985
    Abstract: A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: March 3, 2015
    Assignee: Headway Technologies, Inc.
    Inventors: Lijie Guan, Po-Kang Wang, Moris Dovek, Joe Smyth, Kenichi Takano, Yoshitaka Sasaki
  • Patent number: 8958176
    Abstract: The present invention generally relates to a write head pole laminate structure. The write head pole structure can include multiple multi-layer magnetic structures that are separated by a non-magnetic material that is amorphous or microcrystalline. Each multi-layer magnetic structure includes one or more first magnetic layers that are spaced from one or more second magnetic layers by a non-magnetic layer such that the one or more first magnetic layers are substantially identical to the one or more second magnetic layers. In such a design, the one or more second magnetic layers are antiparallel to the one or more first magnetic layers so that a zero total net magnetic moment is present for the multi-layer magnetic structure when current is removed from the write head pole.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: February 17, 2015
    Assignee: HGST Netherlands B.V
    Inventors: Jeffrey R. Childress, Alexander M. Zeltser
  • Patent number: 8929028
    Abstract: A perpendicular magnetic write head having a laminated trailing return pole structure that reduces magnetic eddy currents in the return pole for improved write head efficiency. The trailing magnetic return pole includes multiple magnetic layers. Each magnetic layer is separated from an adjacent magnetic layer of the return pole by a non-magnetic layer. The non-magnetic layer terminates at a region that is removed from the air bearing surface in order to allow contact between the magnetic layers at the ABS, thereby preventing stray magnetic fields from emitting from the magnetic layers of the write pole.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: January 6, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Wen-Chien D. Hsiao, Yimin Hsu, Jennifer Leung
  • Patent number: 8842388
    Abstract: Embodiments of the present invention provide a perpendicular magnetic recording head including a coil having small resistance. According to one embodiment, a nonmagnetic insulating layer formed on a main magnetic pole and a magnetic yoke are etched to form a recessed portion. The thickness of a conductive layer is increased by the depth of the recessed portion in a process for forming the conductive layer of the upper coil on the recessed portion to reduce resistance of the coil. Simultaneously with the formation of the recessed portion, a part of a second layer of a connection tab is removed. Simultaneously with the formation of the conductive layer of the upper coil, a space in which the part of the second layer of the connection tab is removed is filled with the same material as that of the conductive layer to further reduce the resistance of the entire coil.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: September 23, 2014
    Assignee: HGST Netherlands BV
    Inventors: Atsushi Kato, Ichiro Oodake, Gen Oikawa, Masahiko Soga
  • Patent number: 8837089
    Abstract: A magnetic head includes a main pole and a heater for heating the main pole. The main pole is shaped to have a receiving space formed therein for receiving at least part of the heater. The at least part of the heater is received in the receiving space. The main pole includes a first layer and a second layer stacked. The receiving space is sandwiched between the first layer and the second layer.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: September 16, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H. K. ) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Patent number: 8804282
    Abstract: Approaches for a magnetic write head having a hybrid material main pole, in which a first magnetic material has a first cross-sectional area (A1) and a second magnetic material has a second cross-sectional area (A2), and wherein the ratio A1/A2 reduces in a direction away from the air bearing surface. The first material comprises a high saturation magnetic flux density material, and the second material comprises a high magnetic permeability and low saturation magnetic flux density material having a lower saturation magnetic flux density than said first material.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: August 12, 2014
    Assignee: HGST Netherlands N.V.
    Inventors: Mikito Sugiyama, Hiromi Shiina, Kazue Kudo, Yusuke Takahashi, Kimitoshi Eto
  • Patent number: 8797685
    Abstract: A magnetic write head for data recording having a magnetic write pole with a stepped magnetic shell structure that defines a secondary flare point. The secondary flare point defined by the magnetic shell portion can be more tightly controlled with respect to its distance from the air bearing surface (ABS) of the write head than can a traditional flare point that is photolithographically on the main pole structure. This allows the effective flare point of the write head to be moved much closer to the ABS than would otherwise be possible using currently available tooling and photolithography techniques. The write head also includes a non-magnetic spacer layer formed over the magnetic shell structure that is recessed from the ABS by a distance that is greater than that of the magnetic shell portion. A magnetic shield is formed over the magnetic shell and non-magnetic spacer.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: August 5, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Christian Rene Bonhote, Jeffrey S. Lille, Scott Arthur MacDonald, Xhavin Sinha, Petrus Antonius Van Der Heijden
  • Patent number: 8780498
    Abstract: A magnetic recording transducer comprises a main pole having a bottom, a top wider than the bottom, and a top bevel. The transducer further comprises a nonmagnetic gap covering the main pole, a portion of the nonmagnetic gap residing on the top of the main pole, a first seed layer, at least a portion of the first seed layer covering the portion of the nonmagnetic gap on top of the main pole, a second seed layer residing on the first seed layer, and a wrap-around shield on the second seed layer.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: July 15, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Hai Jiang, Yunhe Huang, Jinwen Wang, Yun-Fei Li, Ying Hong
  • Publication number: 20140177092
    Abstract: A microwave-assisted magnetic recording (MAMR) head according to one embodiment includes a main magnetic pole adapted to generate a writing magnetic field when current is applied to a write coil; a trailing shield positioned, at an air bearing surface (ABS), in a trailing direction from the main magnetic pole; and a field generation layer (FGL) positioned, at the ABS, between the main magnetic pole and the trailing shield, wherein either a portion of the main magnetic pole closer to the FGL or a portion of the trailing shield closer to the FGL is adapted to act as a spin polarization layer.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Hiroyuki Katada, Masato Shiimoto
  • Patent number: 8760807
    Abstract: A method fabricates a magnetic transducer having a nonmagnetic layer and an ABS location corresponding to an ABS. Etch stop and nonmagnetic etchable layers are provided. A side shield layer is provided between the ABS location and the etch stop and etchable layers. A pole trench is formed in the side shield and etchable layers. The pole trench has a pole tip region in the side shield layer and a yoke region in the etchable layer. A nonmagnetic side gap layer, at least part of which is in the pole trench, is provided. A remaining portion of the pole trench has a location and profile for a pole and in which at least part of the pole is formed. A write gap and trailing shield are provided. At least part of the write gap is on the pole. At least part of the trailing shield is on the write gap.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Jinqiu Zhang, Ying Hong, Feng Liu, Zhigang Bai
  • Publication number: 20140168823
    Abstract: A magnetic write head having a write pole and a trailing, wrap-around magnetic shield formed over the write pole and separated from the write pole by a non-magnetic trailing gap layer and non-magnetic side gap layers. The write head includes a remnant magnetic seed layer, that while being used to facilitate electroplating of the magnetic shield, is left intentionally extending beyond the back edge of the magnetic shield. This extended portion of the magnetic seed layer acts as a shunt for magnetic flux and prevents data erasure due to over-writing.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 19, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Wen-Chien D. Hsiao, Quan-chiu H. Lam, Terence T. L. Lam, Aron Pentek, Yi Zheng, Yuming Zhou
  • Publication number: 20140168822
    Abstract: A magnetic read head that has improved pinned layer stability while also maintaining excellent free layer stability. The free layer has sides that define a trackwidth of the sensor and a back edge that defines a functional stripe height of the sensor. However, the pinned layer can extend significantly beyond both the width of the free layer and the back edge (e.g. stripe height) of the free layer. The sensor also has a soft magnetic bias structure that compensates for the reduced volume presented by the side extension of the pinned layer. The soft magnetic bias structure can be magnetically coupled with the trailing magnetic shield, either parallel coupled or anti-parallel coupled. In addition, all or a portion of the soft magnetic bias structure can be exchange coupled to a layer of anti-ferromagnetic material in order to improve the robustness of the soft magnetic bias structure.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 19, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Quang Le, Simon H. Liao, Guangli Liu, Kochan Ju, Youfeng Zheng
  • Publication number: 20140160596
    Abstract: Various embodiments may be generally directed to a data storage device with at least a magnetic element having a magnetic stack positioned adjacent to and separated from at least one side shield on an air bearing surface (ABS). The side shield can be configured with a predetermined anisotropy variation along a down-track direction.
    Type: Application
    Filed: December 11, 2012
    Publication date: June 12, 2014
    Applicant: Seagate Technology LLC
    Inventors: Victor Boris Sapozhnikov, Mohammed Shariat Ullah Patwari, Shaun Eric McKinlay, Konstantin Rudolfovich Nikolaev, Eric Walter Singleton, Jae-Young Yi
  • Publication number: 20140146418
    Abstract: Various embodiments may configure a data storage device with at least a magnetic element having a magnetic stack that is configured with an air bearing surface (ABS) and is separated from a side shield. The side shield can be biased by a biasing layer that contacts the side shield and is separated from the ABS.
    Type: Application
    Filed: November 28, 2012
    Publication date: May 29, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Victor Boris Sapozhnikov, Mohammed Shariat Ullah Patwari, Shaun Eric McKinlay
  • Publication number: 20140146419
    Abstract: A magnetic element may be configured with at least a magnetic stack having first and second magnetically free layers that each has a predetermined stripe height from an air bearing surface (ABS). The first and second magnetically free layers can respectively be configured with first and second uniaxial anisotropies that are crossed in relation to the ABS and angled in response to the predetermined stripe height.
    Type: Application
    Filed: November 28, 2012
    Publication date: May 29, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark William Covington, Victor Boris Sapozhnikov, Wonjoon Jung, Dimitar Velikov Demitrov, Dian Song, Taras Pohkil
  • Publication number: 20140133048
    Abstract: In one embodiment, a MAMR head includes a main magnetic pole, a STO positioned near the main magnetic pole, the STO including a first perpendicular magnetic layer positioned above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer having an axis of magnetic anisotropy in a direction perpendicular to a film surface, a first non-magnetic transmission layer positioned above the first perpendicular magnetic layer, a magnetic layer effectively having a plane of easy magnetization in the film surface positioned above the first non-magnetic transmission layer, the magnetic layer being a FGL, a second non-magnetic transmission layer positioned above the magnetic layer, and a second perpendicular magnetic layer positioned above the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer having magnetic anisotropy in the direction perpendicular to the film plane.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 15, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Masato Shiimoto, Keiichi Nagasaka, Masukazu Igarashi
  • Patent number: 8701273
    Abstract: A method of manufacturing a magnetic head includes the step of forming an accommodation part and the step of forming a return path section. The return path section lies between a main pole and a top surface of a substrate, and connects a shield and part of the main pole away from a medium facing surface to each other so that a space through which part of a coil passes is defined. The accommodation part accommodates at least part of the return path section. The step of forming the return path section forms first to third portions simultaneously. The first portion is located closer to the top surface of the substrate than is the space. The second portion is located closer to the medium facing surface than is the space. The third portion is located farther from the medium facing surface than is the space.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: April 22, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Hironori Araki, Seiichiro Tomita, Kazuki Sato, Shigeki Tanemura, Tatsuya Shimizu
  • Patent number: 8705204
    Abstract: According to one embodiment, a main pole of a recording head includes a first magnetic pole layer and a second magnetic pole layer laminated on the trailing side of the first magnetic pole layer. The first magnetic pole layer includes a tapered portion and a first tip portion. The second magnetic pole layer includes a tapered portion and a second tip portion. A width in a track direction of the second tip portion is smaller than that of the first tip portion. The high-frequency oscillator is between the second tip portion and the trailing shield and includes a width in the track direction substantially equal to the width in the track direction of the second tip portion, and a height of the first tip portion is taller than that of the second tip portion.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: April 22, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tomoko Taguchi, Kenichiro Yamada, Katsuhiko Koui, Tomomi Funayama, Norihito Fujita
  • Patent number: 8670212
    Abstract: A perpendicular magnetic recording (PMR) head is fabricated with a multi-level tapered write pole. The write pole comprises a main pole with a tapered tip on a leading edge or a trailing edge, on which is formed at least one yoke that has a tapered edge. The edge of the yoke is recessed from the ABS of the main pole, giving the head a stepped profile. The yoke can be a single yoke formed on one side of the main pole or it can be two yokes formed on both the leading and trailing sides of the main pole. The write pole structure creates an efficient channeling of magnetic flux to the ABS surface of the pole tip which produces magnetic recording field at high area densities.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: March 11, 2014
    Assignee: Headway Technologies, Inc.
    Inventors: Zhigang Bai, Kowang Liu, Yan Wu, Moris Dovek
  • Patent number: 8634162
    Abstract: A magnetic write head for data recording having a magnetic write pole with a stepped magnetic shell structure that defines a secondary flare point. The secondary flare point defined by the magnetic shell portion can be more tightly controlled with respect to its distance from the air bearing surface (ABS) of the write head than can a traditional flare point that is photolithographically on the main pole structure. This allows the effective flare point of the write head to be moved much closer to the ABS than would otherwise be possible using currently available tooling and photolithography techniques. The write head may also include a magnetic trailing shield that wraps around the main pole portion. The trailing shield can have a hack edge defining a trailing shield throat height that is either between the secondary flare point or coincident or behind the secondary flare point, depending on design requirements.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: January 21, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Christian Rene Bonhote, Thomas Dudley Boone, Jr., Quang Le, Jui-Lung Li, Jeffrey S. Lille, Scott Arthur MacDonald, Neil Leslie Robertson, Xhavin Sinha, Petrus Antonius Van Der Heijden
  • Patent number: 8625233
    Abstract: Systems and methods for fabricating a microelectric device are provided herein. Particular embodiments provide systems and methods for fabricating a magnetic recording pole for a magnetic recording head, such as an energy assisted magnetic recording (EAMR) head commonly used in a disk storage device. Some embodiments provide for systems and methods of fabricating magnetic recording poles that protect the core of the magnetic recording head during the removal of removal of seed layers.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: January 7, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Lili Ji, Ming Jiang, Jerome S. Marcelino, Shawn M. Tanner, Dujiang Wan, Tiffany Yun Wen Jiang
  • Patent number: 8625234
    Abstract: A structure and a process for a perpendicular write pole that provides increased magnetic flux at the ABS is disclosed. This is accomplished by increasing the amount of write flux that originates above the write gap, without changing the pole taper at the ABS. Three embodiment of the invention are discussed.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: January 7, 2014
    Assignee: Headway Technologies, Inc.
    Inventors: Lijie Guan, Po-Kang Wang, Moris Dovek, Joe Smyth, Kenichi Takano, Yoshitaka Sasaki
  • Publication number: 20140002926
    Abstract: According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, a return pole opposed to the main pole with a write gap therebetween, and a high-frequency oscillator between respective facing surfaces of the main pole and the return pole and configured to produce a high-frequency magnetic field. At least one of the main and return poles faces the high-frequency oscillator and includes a laminated structure portion includes a magnetic layer and a nonmagnetic layer laminated to one another.
    Type: Application
    Filed: September 5, 2013
    Publication date: January 2, 2014
    Inventors: Takuya MATSUMOTO, Kenichiro YAMADA, Masayuki TAKAGISHI, Katsuhiko KOUI, Hitoshi IWASAKI
  • Publication number: 20130314820
    Abstract: According to one embodiment, a magnetic recording head includes a main magnetic pole, an auxiliary magnetic pole, and a spin torque oscillator formed between them. The spin torque oscillator includes a main oscillation layer and spin sink layer as an oscillation layer. The spin sink layer contains one of iron and cobalt, and at least one element selected from the group consisting of platinum, palladium, ruthenium, tantalum, chromium, terbium, gadolinium, europium, dysprosium, and samarium.
    Type: Application
    Filed: December 17, 2012
    Publication date: November 28, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Mariko SHIMIZU, Katsuhiko KOUI, Shuichi MURAKAMI, Masahiro TAKASHITA
  • Publication number: 20130308228
    Abstract: A magnetic sensor having reduced read gap thickness, reduced signal noise and improved signal to noise ratio. The sensor includes a sensor stack and hard bias structures formed at either side of the sensor stack for biasing the free layer of the sensor. A protective layer is formed over a portion of the hard bias structure, however a portion of the hard bias structure extends upward toward the upper shield and is disposed between the protective layer and the sensor stack as a result of the process used to form the magnetic bias structure. This portion of the hard bias structure that extends toward the upper shield has a reduced magnetization relative to the rest of the hard bias structure so that it will not magnetically couple with the upper shield.
    Type: Application
    Filed: May 15, 2012
    Publication date: November 21, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hideki Mashima, Nobuo Yoshida, Takahiro Ibusuki, Tsutomu Yasuda
  • Publication number: 20130286507
    Abstract: A thin-film magnetic head has a high write performance because its shape is smooth without roughness. The thin-film magnetic head includes a slider substrate, a write element and an antireflection film. The slider substrate has an air bearing surface at one side and supports a first support layer. The first support layer has a leading shield, and the leading shield has a low-level flat part, a slope part and a high-level flat part continuously arranged at one side in the recited order toward the air bearing surface. The antireflection film entirely covers the low-level flat part, the slope part and the high-level flat part of the leading shield. The write element has a recording magnetic pole film, and the recording magnetic pole film is formed above the antireflection film.
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Applicant: TDK Corporation
    Inventors: Hiromichi Umehara, Masashi Sano, Atsushi Yamaguchi
  • Patent number: 8559132
    Abstract: A laminated write pole layer for a PMR write head is disclosed in which a plurality of “n” magnetic layers and “n?1” non-magnetic spacers are formed in an alternating fashion on a substrate. The non-magnetic spacers promote exchange decoupling or antiferromagnetic coupling between adjacent magnetic layers. Writability is improved when the trailing magnetic layer has a thickness greater than the thickness of other magnetic layers and preferably >25% of the total thickness of the magnetic layers. The thicknesses of the other magnetic layers may be equal or may become progressively smaller with increasing distance from the trailing magnetic layer. In another embodiment, the non-magnetic spacer between the trailing magnetic layer and the nearest magnetic layer is replaced by a magnetic spacer made of a soft magnetic material to promote magnetic coupling and effectively increase the thickness of the trailing magnetic layer.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: October 15, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Kenichi Takano, Lijie Guan, Yuchen Zhou, Joe Smyth, Moris Dovek
  • Patent number: 8553360
    Abstract: Embodiments of the invention provide a magnetic recording head including a write pole having increasing magnetic moment from a leading edge of the write pole to a trailing edge of the write pole, and methods for manufacturing the same. The write pole may be formed with a plurality of different magnetic material layers having different magnetic moments. A first magnetic layer may be formed with a first magnetic material adjacent a leading edge of the write pole. A second magnetic layer having a greater moment may be formed on the first magnetic layer, thereby increasing the magnetic moment from the leading edge of the write pole to the trailing edge of the write pole.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: October 8, 2013
    Assignee: HGST Netherlands B.V.
    Inventor: Liubo Hong
  • Patent number: 8514520
    Abstract: A thin-film magnetic head is constructed such that a main magnetic pole layer, a write shield layer, a gap layer, and a thin-film coil are laminated on a substrate. The write shield layer has an opposing shield part opposing the main magnetic pole layer and a front shield part. The front shield part is connected to the opposing shield part without straddling the thin-film coil. Besides, the front shield part has a shield front end face disposed in the medium-opposing surface and a shield upper end face formed distanced from the medium-opposing surface. Further, the front shield part has a shield connecting part. The shield front end face is connected to the shield upper end face by the shield connecting part.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: August 20, 2013
    Assignees: Headway Technologies, Inc., Sae Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Atsushi Iijima
  • Patent number: 8503131
    Abstract: A magnetic write head for perpendicular magnetic data recording. The write head includes a substrate and a magnetic write pole formed on the substrate, the write pole having a trailing edge and first and second sides. A magnetic stitched pole is formed over a portion of the magnetic write pole, the stitched pole having a front edge that defines a secondary flare point. First and second non-magnetic side walls are formed at the first and second sides of the write pole. The non-magnetic side walls extend from the substrate at least to the trailing edge of the write pole in a first region near an air bearing surface and wherein the first and second non-magnetic side walls extend from the substrate to a point between the substrate and the trailing edge, allowing the stitched magnetic pole to extend partially over the sides of the write pole.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: August 6, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yi Zheng, Yimin Hsu, Wen-Chien David Hsiao, Ming Jiang, Aron Pentek, Sue Siyang Zhang, Edward Hin Pong Lee, Hung-chin Guthrie, Ning Shi, Vladimir Nikitin, Prabodh Ratnaparkhi, Yinshi Liu
  • Patent number: 8498078
    Abstract: Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a plurality of tapered surfaces at or near an air bearing surface (ABS), wherein a thickness of the write pole increases in a direction away from the ABS. A non-magnetic front bump layer may be formed on one or more of the tapered surfaces of the magnetic pole at a distance from the ABS. The front bump layer may increase the separation distance between a shield layer and the magnetic pole near the tapered surface, thereby improving the performance of the write head.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: July 30, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Donald G. Allen, Liubo Hong, Aron Pentek, Thomas J. A. Roucoux, Sue S. Zhang, Yi Zheng
  • Patent number: 8498080
    Abstract: A magnetic head includes a main pole, a write shield, a return path section, a heater that generates heat for making part of a medium facing surface protrude, and a sensor that detects contact of the part of the medium facing surface with a recording medium. The return path section includes: a yoke layer located backward of the main pole along the direction of travel of the recording medium; a first coupling part coupling the yoke layer and the write shield to each other; and a second coupling part located away from the medium facing surface and coupling the yoke layer and the main pole to each other. The first coupling part has an end face facing toward the yoke layer. This end face includes a middle portion spaced from the yoke layer and facing the yoke layer, and two side portions located on opposite sides of the middle portion in a track width direction and in contact with the yoke layer. The sensor is located between the middle portion and the yoke layer.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: July 30, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Atsushi Iijima
  • Publication number: 20130148242
    Abstract: According to one embodiment, a magnetic recording head includes a spin-torque oscillator between a main pole and a trailing shield. An oscillation layer of the spin-torque oscillator is formed by repeatedly stacking two or more laminates each including a metallic magnetic layer of a body-centered cubic crystalline metal and a metallic magnetic layer containing cobalt. The film thickness of each metallic magnetic layer is more than 0.2 nm and not more than 3 nm. The intensity of an anisotropic magnetic field is higher than a value obtained by subtracting the intensity of a gap magnetic field from the intensity of a diamagnetic field and lower than the intensity of the diamagnetic field.
    Type: Application
    Filed: August 14, 2012
    Publication date: June 13, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuhiko KOUI, Mariko KITAZAKI, Shuichi MURAKAMI, Kenichiro YAMADA
  • Patent number: 8451560
    Abstract: Methods for fabrication of tapered magnetic poles with a non-magnetic front bump layer. A magnetic pole may have a tapered surface at or near an air bearing surface (ABS), wherein a thickness of the write pole increases in a direction away from the ABS. A non-magnetic front bump layer may be formed on the tapered surface of the magnetic pole and away from the ABS. The front bump layer may increase the separation distance between a shield layer and the magnetic pole near the tapered surface, thereby improving the performance of the write head.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: May 28, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Liubo Hong, Aron Pentek, Yi Zheng
  • Patent number: 8446692
    Abstract: A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an anti-ferromagnetic (AFM) state during non-writing and switches to a ferromagnetic (FM) state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n?1” AFM-FM phase change material layers arranged in an alternating manner. The AFM-FM phase change material is preferably a FeRh, FeRhPt, FeRhPd, or FeRhIr and may also be used as a flux gate to prevent yoke flux from leaking into the write pole tip. Heating for the AFM to FM transition is provided by write coils and/or a coil located near the AFM-FM phase change material to enable faster transition times.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: May 21, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Yuchen Zhou, Kenichi Takano, Kowang Liu, Kunliang Zhang, Liejie Guan, Moris Dovek, Joe Smyth
  • Patent number: 8441757
    Abstract: A magnetic write head having a write pole with a tapered trailing edge. The write head has a non-magnetic step layer and a non-magnetic bump formed on the front edge of the magnetic step layer. A non-magnetic trailing gap layer is formed over the tapered trailing edge of the write pole and over the non-magnetic bump and over the non-magnetic step layer. A magnetic trailing shield is formed over at least a portion of the non-magnetic gap layer.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: May 14, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yingjian Chen, Liubo Hong, Yimin Hsu, Edward Hin Pong Lee, Katalin Pentek
  • Patent number: 8405930
    Abstract: A method and system for providing a magnetic recording head is described. The magnetic recording head has an ABS configured to reside in proximity to a media during use. The magnetic recording head includes a main pole, first and second auxiliary poles, a backgap, a nonmagnetic spacer, and at least one coil. The main pole includes a pole tip occupying a portion of the ABS and a back edge distal from the ABS. Each auxiliary pole has a front recessed from the ABS and a back portion. A portion of the main pole distal from the ABS resides between the auxiliary poles. The auxiliary poles are magnetically coupled with the main pole. The backgap magnetically couples the back portions of the auxiliary poles. The nonmagnetic spacer adjoins the back edge of the main pole and is between the auxiliary poles. The coil(s) energize the main pole.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: March 26, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Zhanjie Li, Zhigang Bai, Feng Liu, Yugang Wang
  • Patent number: 8400732
    Abstract: The present invention provides a perpendicular magnetic write head capable of preventing unintended erasure of information due to spread of a magnetic field for writing. A leading shield, two side shields, and a trailing shield are disposed around (a front end portion of) a main magnetic pole layer. A nonmagnetic layer having a uniform thickness formed by ALD is provided between the front end portion and two side shields. Consequently, intervals are constant in any positions. Spread of magnetic fields for recording in a write track width direction is suppressed sufficiently more than the case where the intervals vary among positions.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: March 19, 2013
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventor: Naoto Matono
  • Publication number: 20130044394
    Abstract: In certain embodiments, a magnetic had includes a top shield and a bottom shield positioned at an air bearing surface. A polarizer and a nonmagnetic layer are positioned between the top and bottom shields. An analyzer is positioned adjacent the nonmagnetic layer at a distance recessed from the air bearing surface. Current travels through the top shield, polarizer, nonmagnetic layer, and first analyzer.
    Type: Application
    Filed: December 21, 2011
    Publication date: February 21, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventor: Scott Stokes
  • Patent number: 8353098
    Abstract: A method of manufacturing a perpendicular magnetic recording head capable of easily and accurately forming a main magnetic-pole layer having a shape suitable for concentrating a magnetic flux is provided. A nonmagnetic layer having a recessed section (a first recessed section and a second recessed section) is formed, and then an additional nonmagnetic layer is formed on an inner surface of the recessed section. Then, a magnetic layer is formed in the recessed section formed with the additional nonmagnetic layer, and then the magnetic layer is cut to form an air bearing surface, so as to form the main magnetic-pole layer.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: January 15, 2013
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Tetsuya Mino, Naoto Matono, Ikuhito Onodera, Kazushi Nishiyama, Michitoshi Tsuchiya, Kenji Sasaki