Suppression of Barkhausen noise in magnetoresistive sensors employing AC bias

Author

Paperno, Eugene ; Kaplan, Ben-zion

Author_Institution

Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3161

Lastpage

3163

Abstract

A magnetic field rotating in the plane of a thin-film magnetoresistive sensor provides continuous saturation of the ferromagnetic material if the magnitude of the field is sufficiently large. This mode of excitation allows operation free of errors related to remanence and at the same time helps in suppressing Barkhausen noise. The experiment demonstrates that the contribution of the magnetic noise in the sensor output is negligible when the period of the field rotation is less than 1 ms. This enables resolution of dc and low-frequency magnetic fields of the order of 10^-10 T/√Hz. This result can be improved by decreasing the sensor induced anisotropy and a resolution of 10^-11-10^-12 T/√Hz might be attainable

Keywords

Barkhausen effect; ferromagnetic materials; magnetic field measurement; magnetic noise; magnetic sensors; magnetic thin film devices; magnetoresistive devices; AC bias; Barkhausen noise suppression; ferromagnetic material saturation; low-frequency magnetic field resolution; magnetic field rotation period; magnetic noise; remanence; rotating bias method; sensor induced anisotropy; thin-film magnetoresistive sensor; Frequency; Low-frequency noise; Magnetic fields; Magnetic materials; Magnetic noise; Magnetic sensors; Magnetoresistance; Remanence; Sensor phenomena and characterization; Thin film sensors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.490314

Filename

490314