Effect of magnetic anisotropy on signal and noise of NiFe magnetoresistive sensor

Author

Yeh, Tangshiun ; Witcraft, William F.

Author_Institution

Solid State Electron. Center, Honeywell Inc., Plymouth, MN, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3131

Lastpage

3133

Abstract

The effect of magnetic anisotropy field (K_K) on the signal and noise characteristics of NiFe magnetoresistive (MR) sensor has been studied. Lowering the anisotropy field of the thin NiFe films not only increases the sensitivity of the MR sensors but also induces higher noise. The experimental results show that the sensitivity is inversely proportional to the anisotropy field H_K, while the noise is inversely proportional to the (H_K)². The increased sensitivity of the MR sensor is attributed to the increased susceptibility of the sample films associated with lowering the anisotropy field. The noise level of the sensor is found to be increased with decreased anisotropy field, which can be explained by the induced instability of the magnetic domain structure of the NiFe films due to the anisotropy field decrease

Keywords

iron alloys; magnetic anisotropy; magnetic noise; magnetic sensors; magnetic thin film devices; magnetoresistive devices; nickel alloys; NiFe; NiFe thin film; instability; magnetic anisotropy; magnetic domain structure; magnetoresistive sensor; noise; sensitivity; signal; susceptibility; Bridge circuits; Magnetic anisotropy; Magnetic field measurement; Magnetic films; Magnetic noise; Magnetic properties; Magnetic sensors; Magnetoresistance; Semiconductor device noise; Sensor phenomena and characterization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490304

Filename

490304