Sub-nano tesla resolution differential magnetic field sensor utilizing asymmetrical magnetoimpedance in multilayer films

Author

Delooze, Paul ; Panina, Larissa V. ; Mapps, Desmond J. ; Ueno, Kasuhiko ; Sano, Hiroyuki

Author_Institution

Dept. of Commun. & Electron. Eng., Univ. of Plymouth, UK

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2664

Lastpage

2666

Abstract

Asymmetrical magnetoimpedance (AMI) in multilayer thin films with cross anisotropy has been used for the development of a low noise, sensitive and quick response miniature magnetic sensor. The sensor is driven by a sinusoidal current of 90 MHz biased with a dc current. For an AMI film element of dimensions 5 mm long, 40 μm wide, and having an anisotropy angle of 45°, the field detection resolution is in the order of 1 μ Oe for both ac and dc fields of magnitude 1 Oe. The maximum response speed is in the order of 1 MHz.

Keywords

magnetic anisotropy; magnetic multilayers; magnetic sensors; magnetoresistive devices; 1 MHz; 90 MHz; asymmetrical magnetoimpedance; cross anisotropy; differential magnetic field sensor; magnetic sensor; multilayer thin films; sub-nano tesla resolution; Ambient intelligence; Amorphous magnetic materials; Anisotropic magnetoresistance; Impedance; Magnetic anisotropy; Magnetic films; Magnetic multilayers; Magnetic sensors; Perpendicular magnetic anisotropy; Thin film sensors; Crossed anisotropy; differential sensor; magnetoimpedance; multilayers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.830423

Filename

1325602