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

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 Ni/sub 78/-Fe/sub 13/-Cu/sub 5/-Mo/sub 4/ layers were multilayered between...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2004-07, Vol.40 (4), p.2679-2681
Main Authors: Takezawa, M., Dobashi, M., Yamasaki, J.
Format: Article
Language:English
Subjects:
Antiferromagnetic materials
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Couplings
Exact sciences and technology
Magnetic field measurement
Magnetic films
Magnetic heads
Magnetic properties and materials
Magnetic sensors
Magnetism
Physics
Radio frequency
Sensor phenomena and characterization
Sputtering
Thin film sensors
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Summary: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 Ni/sub 78/-Fe/sub 13/-Cu/sub 5/-Mo/sub 4/ layers were multilayered between five 50-nm-thick antiferromagnetic Ir/sub 22/-Mn/sub 78/ layers by radio-frequency sputtering. The asymmetrical GMI characteristics and high sensitivity of 331 /spl Omega//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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2004.830150