Asymmetric high-frequency carrier-type magnetic field sensor with thin-film head structure

Author

Takezawa, Masaaki ; Dobashi, Masatake ; Yamasaki, Jiro

Author_Institution

Dept. of Appl. Sci. for Integrated Syst. Eng., Kyushu Inst. of Technol., Kitakyushu, Japan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2679

Lastpage

2681

Abstract

An asymmetric giant magneto-impedance (GMI) sensor head consisting of ferro/antiferromagnetic exchange coupling multilayered films was fabricated, and its sensor characteristics were measured. Five 100-nm-thick ferromagnetic Ni₇₈-Fe₁₃-Cu₅-Mo₄ layers were multilayered between five 50-nm-thick antiferromagnetic Ir₂₂-Mn₇₈ layers by radio-frequency sputtering. The asymmetrical GMI characteristics and high sensitivity of 331 Ω/T were obtained with the sensor head. Moreover, it becomes clear that feedback control is possible with a conductive line fabricated on the sensor head. It is considered that small clearance between the sensor head and recording media can be realized by the thin-film head structure.

Keywords

copper alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic anisotropy; magnetic heads; magnetic multilayers; magnetic sensors; molybdenum alloys; nickel alloys; thin films; 100 nm; 50 nm; GMI thin-film head; Ir₂₂-Mn₇₈; Ni₇₈-Fe₁₃-Cu₅-Mo₄; asymmetric sensor; carrier-type magnetic field sensor; exchange-coupling field; feedback control; ferro-antiferromagnetic exchange coupling; giant magneto-impedance sensor head; multilayered films; radio-frequency sputtering; recording media; thin-film head structure; unidirectional anisotropy; Antiferromagnetic materials; Couplings; Magnetic field measurement; Magnetic films; Magnetic heads; Magnetic sensors; Radio frequency; Sensor phenomena and characterization; Sputtering; Thin film sensors; Exchange-coupling field; GMI; giant magneto-impedance; thin-film head; unidirectional anisotropy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.830150

Filename

1325607