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1. US20220013139 - Method to Reduce Baseline Shift for a SOT Differential Reader

Office
United States of America
Application Number 17029826
Application Date 23.09.2020
Publication Number 20220013139
Publication Date 13.01.2022
Grant Number 11222656
Grant Date 11.01.2022
Publication Kind B1
IPC
G11B 5/37
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
33Structure or manufacture of flux-sensitive heads
37using galvano-magnetic devices, e.g. Hall-effect devices
G11B 5/11
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
10Structure or manufacture of housings or shields for heads
11Shielding of head against electric or magnetic fields
G11B 5/23
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
187Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to, the recording medium; Pole pieces; Gap features
23Gap features
CPC
G11B 5/232
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
187Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
23Gap features
232Manufacture of gap
G11B 5/372
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
127Structure or manufacture of heads, e.g. inductive
33Structure or manufacture of flux-sensitive heads, ; i.e. for reproduction only; Combination of such heads with means for recording or erasing only
37using galvano-magnetic devices, e.g. Hall-effect devices
372in magnetic thin films
G11B 5/112
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
10Structure or manufacture of housings or shields for heads
11Shielding of head against electric or magnetic fields
112Manufacture of shielding device
Applicants Western Digital Technologies, Inc.
Inventors Quang LE
Xiaoyong LIU
Zhigang BAI
Zhanjie LI
Kuok San HO
Hisashi TAKANO
Title
(EN) Method to Reduce Baseline Shift for a SOT Differential Reader
Abstract
(EN)

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 layer, a first free layer, a gap layer, a second spin hall layer, a second free layer, and a second shield. The gap layer functions as an electrode and is disposed between the first spin hall layer and the second spin hall layer. Electrical lead connections are located about the first spin hall layer, the second spin hall 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).


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