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Characterization of Magnetic and Dielectric Properties on Y-Type Magnetoplumbite Epitaxial thin Films for High Frequency Application

Published online by Cambridge University Press:  17 March 2011

K. Ueno
Affiliation:
Central Technology Laboratory, Asahi Kasei Corporation, 2-1 Samejima, Fuji, Shizuoka, 416-8501, Japan.
I. Ohkubo
Affiliation:
Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Y. Matsumoto
Affiliation:
Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
N. Okazaki
Affiliation:
Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
T. Hasegawa
Affiliation:
Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
K. Itaka
Affiliation:
COMET-NIMS, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
H. Koinuma
Affiliation:
Frontier Collaborative Research Center and Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
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Abstract

Magnetic films for miniaturization of planar inductors operating at GHz frequencies require high resistivity and high ferro-magnetic resonance frequency. Y type magnetoplumbite Ba2Co2Fe12O22(Co2Y) is a candidate material to meet such requirements because it has about 10 &m resistivity and resonance frequency higher than 2 GHz. Recently we succeeded in the fabrication of Co2Y epitaxial thin film on MgAl2O4 substrate by combinatorial pulsed laser deposition technique [3]. Here, we report on the magnetic and dielectric properties of this film. The DC resistivity of the film was 7.5 &m. The dielectric constant at 1.25 GHz was measured by a microwave microscope to be 11.0. An easy axis coercive force and saturation magnetization were about 145 Oe and 2000 Gauss respectively, being close to those of bulk sample. Furthermore, the magnetic micro domain structures of Co2Y epitaxial thin films were observed by a scanning SQUID microscope.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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