Characterization of Tunable Magnetic Sensor Using Bias Magnetic Field of a Hard Magnetic Film Magnetized by Pulsed-Magnetic Field

Author

Sonehara, Makoto ; Kamada, Hiroki ; Iida, S. ; Sato, Takao

Author_Institution

Spin Device Technol. Center, Shinshu Univ., Nagano, Japan

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

3854

Lastpage

3857

Abstract

A tunable magnetoresistance (MR) sensor with variable sensitivity and measuring range is fabricated and characterized. The sensor has been fabricated using a combination of Ni-Fe soft magnetic film, Fe-Co-Sm hard magnetic film. The sensor is placed in a magnetizing coil for the process of magnetizing the hard magnetic film. The sensitivity and the measuring range of the sensor are tuned by bias magnetic field produced by the magnetic poles of the hard magnetic film. The sensitivity change was about 60%, and the measuring range change was about 30% in the tunable MR sensor from the experimental results. The bias magnetic field is controlled by changing amplitude of the pulsed magnetic field in the magnetizing for the hard magnetic film. The control power for one time tuning is about 18 μWh .

Keywords

cobalt alloys; coils; iron alloys; magnetic fields; magnetic sensors; magnetic thin films; magnetoresistance; metallic thin films; nickel alloys; permanent magnets; samarium alloys; soft magnetic materials; Fe-Co-Sm hard magnetic film; FeCoSm; Ni-Fe soft magnetic film; NiFe; bias magnetic field; control power; magnetic poles; magnetizing coil; magnetoresistance sensor; one time tuning; pulsed magnetic field; sensitivity; sensor measuring range; tunable magnetic sensor; Magnetic domains; Magnetic hysteresis; Magnetic resonance; Perpendicular magnetic anisotropy; Saturation magnetization; Soft magnetic materials; Hard magnetic film; pulsed magnetic field magnetizing method; soft magnetic film; tunable magnetic sensor; variable sensitivity and measuring range;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2248078

Filename

6559068