公开(公告)号：US20250095673A1

公开(公告)日：2025-03-20

申请号：US18368220

申请日：2023-09-14

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Xiaoyong LIU ,  Fan TUO ,  Brian R. YORK ,  Cherngye HWANG ,  Hisashi TAKANO

IPC: G11B5/127

Abstract: The present disclosure generally relates to a magnetic recording head comprising one or more spin-orbit torque (SOT) devices, the SOT devices each comprising a bismuth antimony (BiSb) layer. The magnetic recording head comprises a SOT device comprising a first shield extending to a media facing surface (MFS), a seed layer disposed over the first shield, the seed layer being disposed at the MFS, a free layer disposed on the seed layer, the free layer being disposed at the MFS, a bismuth antimony (BiSb) layer disposed over the free layer, the BiSb layer being recessed from the MFS, a second shield disposed over the BiSb layer, the second shield extending to the MFS, and a shield notch coupled to the second shield, the shield notch being disposed between the first shield and the second shield. The magnetic recording head may be a two-dimensional magnetic recording head comprising two SOT devices.

公开(公告)号：US20240310459A1

公开(公告)日：2024-09-19

申请号：US18350584

申请日：2023-07-11

Applicant: Western Digital Technologies, Inc. ,  Tokyo Institute of Technology

Inventor： Quang LE ,  Xiaoyong LIU ,  Brian R. YORK ,  Cherngye HWANG ,  Rohan Babu NAGABHIRAVA ,  Kuok San HO ,  Hisashi TAKANO ,  Son T. LE ,  Nam Hai PHAM ,  Huy H. HO

IPC: G01R33/07 ,  G01R33/00 ,  G01R33/09

CPC classification number: G01R33/075 ,  G01R33/0052 ,  G01R33/093

Abstract: The present disclosure generally relates to temperature detection devices including a ferromagnetic (FM) material disposed at a media facing surface (MFS). The FM material is configured to produce a first electric voltage signal in response to a temperature gradient due to an anomalous Nernst effect. The temperature detection device may also include a spin-orbit torque (SOT) material abutting the FM material. The SOT material includes at least one of BiSb, a topological insulator, a topological half-Heusler alloy, or a weakly oxidized heavy metal. The SOT material is recessed from the MFS, wherein the SOT material is configured to receive a spin current parallel to the temperature gradient generated by a spin Seebeck effect in the FM material. The spin current is detectable as a second electric voltage signal via an inverse spin Hall effect. The first electric voltage signal is added to the second electric voltage signal.

公开(公告)号：US20240144960A1

公开(公告)日：2024-05-02

申请号：US18226625

申请日：2023-07-26

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Rohan Babu NAGABHIRAVA ,  Xiaoyong LIU ,  Brian R. YORK ,  Son T. LE ,  Cherngye HWANG ,  Kuok San HO ,  Hisashi TAKANO

IPC: G11B5/11 ,  G11B5/31

CPC classification number: G11B5/11 ,  G11B5/3116

Abstract: The present disclosure generally relates to a two dimensional magnetic recording (TDMR) spin-orbit torque (SOT) read head comprising bismuth antimony (BiSb) layers. The read head comprises a lower reader comprising a first SOT stack and an upper reader comprising a second SOT stack. The first SOT stack and the second SOT stack each individually comprise a BiSb layer recessed from a media facing surface (MFS) and a free layer exposed at the MFS. The BiSb layers of each SOT stack are recessed from the MFS a distance of about 5 nm to about 20 nm, the distance being less than a length of the free layers. In one embodiment, the lower reader and the upper reader share a current path. In another embodiment, the lower reader and the upper reader have separate current paths.

公开(公告)号：US20240032437A1

公开(公告)日：2024-01-25

申请号：US18197495

申请日：2023-05-15

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Brian R. YORK ,  Cherngye HWANG ,  Xiaoyong LIU ,  Susumu OKAMURA ,  Michael A. GRIBELYUK ,  Xiaoyu XU ,  Randy G. SIMMONS ,  Kuok San HO ,  Hisashi TAKANO

IPC: H10N50/10 ,  H10N50/85 ,  G11C11/16 ,  H10B61/00 ,  G01R33/09 ,  G11B5/39

CPC classification number: H10N50/10 ,  H10N50/85 ,  G11C11/161 ,  H10B61/00 ,  G01R33/093 ,  G11B5/3909

Abstract: The present disclosure generally relates to spin-orbit torque (SOT) devices comprising a bismuth antimony (BiSb) layer. The SOT devices further comprises a nonmagnetic buffer layer, a nonmagnetic interlayer, a ferromagnetic layer, and a nonmagnetic barrier layer. One or more of the barrier layer, interlayer, and buffer layer comprise a polycrystalline non-Heusler alloy material, or a Heusler alloy and a material selected from the group consisting of: Cu, Ag, Ge, Mn, Ni, Co, Mo, W, Sn, B, and In. The Heusler alloy is a full Heusler alloy comprising X2YZ or a half Heusler alloy comprising XYZ, where X is one of: Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Ir, Pt, and Au, Y is one of: Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Nb, Mo, Hf, and W, and Z is one of: B, Al, Si, Ga, Ge, As, In, Sn, Sb, and Bi.

公开(公告)号：US20230306993A1

公开(公告)日：2023-09-28

申请号：US17705147

申请日：2022-03-25

Applicant: Western Digital Technologies, Inc. ,  Tokyo Institute of Technology

Inventor： Quang LE ,  Brian R. YORK ,  Xiaoyong LIU ,  Son T. LE ,  Cherngye HWANG ,  Michael A. GRIBELYUK ,  Xiaoyu XU ,  Kuok San HO ,  Hisashi TAKANO ,  Julian SASAKI ,  Huy H. HO ,  Khang H. D. NGUYEN ,  Nam Hai PHAM

IPC: G11B5/39

CPC classification number: G11B5/39 ,  G11B2005/3996 ,  G11B2005/0021

Abstract: The present disclosure generally relate to spin-orbit torque (SOT) devices. The SOT devices each comprise a non-magnetic layer, a free layer disposed in contact with the non-magnetic layer, and a bismuth antimony (BiSb) layer disposed over the free layer. The non-magnetic layer has a thickness of about 0.5 nm to about 2 nm. The BiSb layer has a thickness of about 5 nm to about 10 nm. The BiSb layer and the free layer have collective thickness between about 5 nm to about 20 nm. By reducing the thickness of the non-magnetic layer and BiSb layer, a read gap of each SOT device is reduced while enabling large inverse spin Hall angles and high signal-to-noise ratios.

公开(公告)号：US20230047223A1

公开(公告)日：2023-02-16

申请号：US17401856

申请日：2021-08-13

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Brian R. YORK ,  Cherngye HWANG ,  Susumu OKAMURA ,  Michael GRIBELYUK ,  Xiaoyong LIU ,  Kuok San HO ,  Hisashi TAKANO

IPC: H01F10/32 ,  H01L27/22 ,  H01L43/04 ,  H01L43/06 ,  H01L43/10 ,  G11B5/39

Abstract: The present disclosure generally relate to spin-orbit torque (SOT) magnetic tunnel junction (MTJ) devices comprising a buffer layer, a bismuth antimony (BiSb) layer having a (012) orientation disposed on the buffer layer, and an interlayer disposed on the BiSb layer. The buffer layer and the interlayer may each independently be a single layer of material or a multilayer of material. The buffer layer and the interlayer each comprise at least one of a covalently bonded amorphous material, a tetragonal (001) material, a tetragonal (110) material, a body-centered cubic (bcc) (100) material, a face-centered cubic (fcc) (100) material, a textured bcc (100) material, a textured fcc (100) material, a textured (100) material, or an amorphous metallic material. The buffer layer and the interlayer inhibit antimony (Sb) migration within the BiSb layer and enhance uniformity of the BiSb layer while further promoting the (012) orientation of the BiSb layer.

公开(公告)号：US20230040698A1

公开(公告)日：2023-02-09

申请号：US17396213

申请日：2021-08-06

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Xiaoyong LIU ,  Kuok San HO ,  Hisashi TAKANO

IPC: G11B5/592 ,  G11B5/11 ,  G11B5/008 ,  G11B5/265

Abstract: The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. Each pair comprises a null shield disposed between the write transducer and the read transducer. The null shield is used to create a null region, or a region where write flux goes to zero, and comprises laminated antiferromagnetic coupling materials to protect writer flux from going to the read transducer. The read transducer is disposed in the null region. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.

公开(公告)号：US20220013138A1

公开(公告)日：2022-01-13

申请号：US17395306

申请日：2021-08-05

Applicant: Western Digital Technologies, Inc.

Inventor： Cherngye HWANG ,  Xiaoyong LIU ,  Quang LE ,  Kuok San HO ,  Hisashi TAKANO ,  Brian R. YORK

IPC: G11B5/31 ,  G11B5/11

Abstract: The present disclosure generally relates to spin-orbital torque (SOT) differential reader designs. The SOT differential reader is a multi-terminal device comprising a first seed layer, a first spin hall effect (SHE) layer, a first interlayer, a first free layer, a gap layer, a second seed layer, a second SHE layer, a second free layer, and a second interlayer. The gap layer is disposed between the first SHE layer and the second SHE layer. The materials and dimensions used for the first and second seed layers, the first and second interlayers, and the first and second SHE layers affect the resulting spin hall voltage converted from spin current injected from the first free layer and the second free layer, as well as the ability to tune the first and second SHE layers. Moreover, the SOT differential reader improves reader resolution without decreasing the shield-to-shield spacing (i.e., read-gap).

公开(公告)号：US20210390976A1

公开(公告)日：2021-12-16

申请号：US17463368

申请日：2021-08-31

Applicant: Western Digital Technologies, Inc.

Inventor： Thao A. NGUYEN ,  Michael Kuok San HO ,  Zhigang BAI ,  Zhanjie LI ,  Quang LE

IPC: G11B5/09 ,  G11B5/60 ,  G11B5/40 ,  G11B5/31 ,  G11B5/23 ,  G11B5/187

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, a second write head, at least one read head, and a thermal fly height control element. The first write head is a wide writing write head comprising a first main pole and a first trailing shield. The second write head a narrow writing write head comprising a second main pole, a trailing gap, a second trailing shield, and one or more side shields. The first main pole has a shorter height and a greater width than the second main pole. The second main pole has a curved or U-shaped surface disposed adjacent to the trailing gap. The thermal fly height control element and the at least one read head are aligned with a center axis of the second main pole of the second write head.

公开(公告)号：US20210280208A1

公开(公告)日：2021-09-09

申请号：US17330176

申请日：2021-05-25

Applicant: Western Digital Technologies, Inc.

Inventor： Suping SONG ,  Zhanjie LI ,  Michael Kuok San HO ,  Quang LE ,  Alexander M. ZELTSER

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/23

Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.