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Spin-orbit torque induced magnetization switching in a magnetic recording head

a technology of spin-orbit torque and magnetic recording head, which is applied in the direction of magnetic recording, data recording, instruments, etc., can solve the problems of difficult pseudo-spin-valve structure and lower energy efficiency

Inactive Publication Date: 2019-09-12
WESTERN DIGITAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a new type of magnetic media drive that uses a new recording head design to improve the performance of a magnetic recording device. The new design uses a spin-orbit torque (SOT) based head, which reduces the switching current and voltage required to operate it. This new design also makes it easier to form the layers of the head compared to conventional designs. The patent also describes a data storage device that includes the new magnetic media drive. The technical effects of this patent are improved energy efficiency and higher efficiency in recording data on magnetic media.

Problems solved by technology

The pseudo spin-valve structure is difficult to make, and high switching current and voltage (Vjump) are utilized during its operation, leading to a lower level of energy efficiency.

Method used

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  • Spin-orbit torque induced magnetization switching in a magnetic recording head
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  • Spin-orbit torque induced magnetization switching in a magnetic recording head

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Embodiment Construction

[0013]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, a trailing shield hot seed layer, a spin Hall layer disposed between the main pole and the trailing shield hot seed layer, and a spin-torque layer disposed between the main pole and the trailing shield hot seed layer. Spin-orbit torque (SOT) is generated from the spin Hall layer. The spin-torque layer magnetization switching (or precession) is induced by the SOT. The SOT based head reduces the switching current and the Vjump due to higher spin polarization ratio, which improves energy efficiency. In addition, the spin Hall layer and the spin-torque layer are easier to form compared to the conventional pseudo spin-valve structure.

[0014]The terms “over,”“under,”“between,” and “on” as used herein refer to a relative position of one layer with respect to other layers. As such, for example, one layer d...

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Abstract

The present disclosure generally relates to magnetic media devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The recording head includes a main pole, a trailing shield hot seed layer, a spin Hall layer disposed between the main pole and the trailing shield hot seed layer, and a spin-torque layer disposed between the main pole and the trailing shield hot seed layer. Spin-orbit torque (SOT) is generated from the spin Hall layer. The spin-torque layer magnetization switching or precession is induced by the SOT. The SOT based head reduces the switching current and the Vjump due to higher spin polarization ratio, which improves energy efficiency. In addition, the spin Hall layer and the spin-torque layer are easier to form compared to the conventional pseudo spin-valve structure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a Continuation of U.S. patent application Ser. No. 15 / 379,226, filed on Dec. 14, 2016, which is incorporated by reference herein in its entirety.BACKGROUNDField of the Disclosure[0002]Embodiments of the present disclosure generally relate to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head.Description of the Related Art[0003]Over the past few years, microwave assisted magnetic recording (MAMR) has been studied as a recording method to improve the areal density of a magnetic media device, such as a hard disk drive (HDD). Conventionally, MAMR enabled magnetic recording is based on spin-transfer torque (STT), which is generated from a pseudo spin-valve structure. During operation, electrical current flows from the main pole to the trailing shield hot seed layer, and the spin-torque layer magnetization switching (or precession) is induced by the STT.[0004]The...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B5/31G11B5/37
CPCG11B5/3146G11B5/372G11B5/314G11B5/37G11B5/315G11B5/3143G11B5/3133G11B5/374G11B2005/0024G11B5/3116
Inventor LI, ZHANJIESONG, SUPINGHO, KUOK SAN
Owner WESTERN DIGITAL TECH INC
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