TRAPEZOIDAL BACK BIAS AND TRILAYER READER GEOMETRY TO ENHANCE DEVICE PERFORMANCE

A magnetoresistive sensor having a trilayer sensor stack with two ferromagnetic freelayers separated by a nonmagnetic spacer layer is disclosed. The sensor is biased with a back biasing magnet adjacent a back of the trilayer sensor. The back biasing magnet, the trilayer sensor stack, or both have su...

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Bibliographic Details
Main Authors WANG ZHONGYAN, CRAIG BEVERLEY, GAO KAIZHONG, QIU JIAOMING, CHEN YONGHUA, VAS'KO VLADYSLAV A
Format Patent
LanguageEnglish
Published 13.01.2011
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:A magnetoresistive sensor having a trilayer sensor stack with two ferromagnetic freelayers separated by a nonmagnetic spacer layer is disclosed. The sensor is biased with a back biasing magnet adjacent a back of the trilayer sensor. The back biasing magnet, the trilayer sensor stack, or both have substantially trapezoidal shapes to enhance the biasing field and to minimize noise. In some embodiments, the trilayer sensor or back bias magnet have a shape designed to stabilize a micromagnetic "C" shape or concentrate magnetic flux in the trilayer sensor stack.
Bibliography:Application Number: US20090502104