Western Digital (fremont), Inc.

Western Digital Technologies, Inc.

Headway Technologies, Incorporated

Sandisk Technologies Inc.

Zhigang Bai

Zhanjie Li

Feng Q Liu

Quang Le

Yugang Wang

Yaguang Wei

Terence T Lam

Michael Kuok San Ho

Lijie Guan

Tao Pan

Yan Wu

Ut Tran

Muhammad Asif Bashir

Venkatesh Chembrolu

Moris Musa Dovek

Kuok San Ho

Suping Song

Xiaoyong Liu

Changqing Shi

Yunfei Ding

Michael Ho

Supradeep Narayana

Alexander Goncharov

Peng Luo

Jian-Gang Zhu

Petrus Antonius Van Der Heijden

Thao Anh Nguyen

Kevin K Lin

Anna Zheng

Jinqiu Zhang

James Terrence Olson

Dehua Han

Ying Hong

Rajeev Nagabhirava

Lisha Wang

Sining Mao

Kowang Liu

Youfeng Zheng

Xinjiang Shen

Yi Wang

Yuchen Zhou

Daniele Mauri

Hisashi Takano

Cherng-Chyi Han

Ming Sun

Matthew R Gibbons

Jiun-Ting Lee

Yunfei Li

Shaoping Li

Kroum Stanimirov Stoev

Francis H Liu

Sharat Batra

Hongquan Jiang

Yongchul Ahn

Weimin Si

Samuel Weisan Yuan

Xiaoyu Yang

Min Li

Kunliang Zhang

Ming Jiang

Aron Pentek

Kenichi Takano

Masato Shiimoto

Yong Shen

Hai Sun

Michael V Morelli

Hongxing Yuan

Alexander M Taratorin

Fenglin Liu

Min Zheng

Jianing Zhou

Tao Lin

Ling Wang

Yunhe Huang

Xiaojun Zhang

Erhard Theodor Schreck

Po-Kang Wang

Barry C Stipe

Edward Hin Pong Lee

Yue Liu

Xuhui Jin

Hong Zhang

Joe Smyth

Ge Yi

Yan Chen

Brad Vaughn Johnson

Amanda Baer

Donghong Li

Tobias Maletzky

Cherng Chyi Han

Laurence Lujun Chen

Yu Lo

Carl F Elliott

Davide Guarisco

Jose Antonio Medina

Jikou Zhou

Lieping Zhong

Goncalo Baiao De Albuquerque

Goncalo Marcos Baião De Albuquerque

Li He

The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head that provides a low resistance cross-track current path at the trailing side of the main pole. A bias current may be driven through the path to enhance the magnetic write field to the magnetic recording media. The current is driven by an alternating current (AC) source external to the head. In some embodiments, the cross-track current going through the low resistance path enables high amounts of current to be utilized without break down of the magnetic recording head.

Magnetic recording head with a cross-track current flow in a low resistance path

The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.

Magnetic recording head with assisting electric current in trailing shield

An apparatus is provided that includes an array including n rows and m columns of nodes, each row of nodes coupled to one of n first conductive lines, each column of nodes coupled to one of m second conductive lines, each node of the n rows and m columns of nodes including a spin orbit torque MRAM non-volatile memory cell configured to store a corresponding weight of an n×m array of weights each having a first weight value or a second weight value, and a control circuit configured to apply n input voltages each having a first input value or a second input value to corresponding n first conductive lines, the n input voltages corresponding to an n-element input vector. The spin orbit torque MRAM non-volatile memory cells are configured to generate m output currents at the m second conductive lines upon application of the n input voltages. The m output currents corresponding to a result of multiplying the input vector by the n×m array of weights.

Matrix-vector multiplication using SOT-based non-volatile memory cells

Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.

Magnetic recording devices having external alternating current sources

The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.

Dual FGL and dual SPL spintronic device to reduce perpendicular field at writing location

The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.

Spintronic device comprising dual FGL and dual SPL to reduce perpendicular field at writing location

Magnetic recording head having leads over the trailing shield for assisting electric currents

The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a current flow in a cross-track direction around a main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the main pole and the trailing shield. A hot seed layer is disposed between the trailing gap and the trailing shield. A first insulation layer is disposed between the hot seed layer and the trailing shield, where the first insulation layer contacts the side shields. A second insulation layer is disposed between the main pole and leading shield, where the second insulation layer contacts the side shields. The first and second insulation layers direct the current through the side shields and across the main pole in a cross-track direction.

Cross track current design for energy assisted magnetic recording

Aspects of the present disclosure generally relate to optical devices and related methods that facilitate tilt in camera systems, such as tilt of a lens. In one example, an optical device includes a lens, an image sensor disposed below the lens, a plurality of magnets disposed about the lens, and a plurality of: (1) vertical coil structures coiled in one or more vertical planes and (2) horizontal coil structures coiled in one or more horizontal planes. When power is applied, the coil structures can generate magnetic fields that, in the presence of the magnets, cause relative movement of the coil structures and associated structures. The plurality of vertical coil structures are configured to horizontally move the lens. The plurality of horizontal coil structures are configured to tilt the lens when differing electrical power is applied to at least two of the plurality of horizontal coil structures.

Optical devices for tilt in camera systems

A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.

Magnetic head with assisted magnetic recording comprising an electrically conductive, non-magnetic material

A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes first and second electrically conductive, non-magnetic material layers. The spin torque oscillator stack is coupled to the first electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.

Magnetic head with assisted magnetic recording

The present disclosure generally relates to spin-orbital torque (SOT) differential reader designs. The SOT differential reader is a multi-terminal device that comprises a first shield, a first spin hall effect layer, a first free layer, a gap layer, a second spin hall effect layer, a second free layer, and a second shield. The gap layer is disposed between the first spin hall effect layer and the second spin hall effect layer. Electrical lead connections are located about the first spin hall effect layer, the second spin hall effect layer, the gap layer, the first shield, and/or the second shield. The electrical lead connections facilitate the flow of current and/or voltage from a negative lead to a positive lead. The positioning of the electrical lead connections and the positioning of the SOT differential layers improves reader resolution without decreasing the shield-to-shield spacing (i.e., read-gap).

SOT differential reader and method of making same

A magnetic recording device includes a main pole, a coil around the main pole, a trailing shield, and a leading shield. A trailing gap is between the main pole and the trailing shield. In one embodiment, the trailing gap includes a non-magnetic conductive material. In another embodiment, the trailing gap includes a spin torque oscillator device. A leading gap is between the main pole and the leading shield. The leading gap includes a non-magnetic conductive material. The main pole is coupled to a first terminal. The trailing shield coupled to a second terminal. The leading shield is coupled to a third terminal.

Three terminal magnetic recording head

Growing community of inventors

Fremont, CA, United States of America

Zhigang Bai