A new technique of noise reduction for large aspect magnetoresistors

Author

Flynn, David I.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

30

Issue

3

fYear

1994

fDate

5/1/1994 12:00:00 AM

Firstpage

1263

Lastpage

1266

Abstract

A large aspect (width to thickness ratio) magnetoresistive sensor operated with an alternating transverse biasing is characterized by high sensitivity and reduced temperature drift. However, it has little demagnetizing anisotropy to maintain a single domain state so noisy behavior often results. A constant longitudinal field can be used to reduce this noise but at the expense of reduced sensitivity. A new unipolar a.c. longitudinal biasing technique is presented which allows the full sensitivity to be achieved whilst significantly reducing magnetic noise and hysteresis

Keywords

electric sensing devices; magnetic anisotropy; magnetic hysteresis; magnetoresistive devices; alternating transverse biasing; constant longitudinal field; demagnetizing anisotropy; hysteresis; large aspect magnetoresistors; magnetoresistive sensors; noise reduction; sensitivity; single domain state; temperature drift; unipolar AC longitudinal biasing technique; Conductivity; Demagnetization; Equations; Magnetic fields; Magnetic films; Magnetic noise; Magnetic sensors; Magnetoresistive devices; Noise reduction; Temperature sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.297763

Filename

297763