Title :
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
fDate :
7/1/2004 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.830150
