MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Engineering Materials and Their Applications
Tunneling Magnetodielectric Effect in Co–Al2O3 Granular Films
Moe KimuraYang CaoHanae Kijima-AokiNobukiyo KobayashiShigehiro OhnumaHiroshi Masumoto
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2022 年 63 巻 12 号 p. 1677-1681

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In this study, we investigated the tunneling magnetodielectric (TMD) effect in cobalt–aluminum-oxide (Co–Al2O3) nanogranular films. The films showed a homogeneous granular structure composed of nanometer Co granules dispersed in an Al2O3 matrix and demonstrated a TMD response with a maximum TMD ratio {(ε′H=850kA/m − ε′H=0kA/m)/ε′H=0kA/m} of 1.1% at a frequency of 5.0 MHz at room temperature. These results show the existence of the TMD effect in the magnetic metal–oxide composite, which would promote the wide applications of the magnetic metal–oxide nanogranular materials in magnetoelectric devices.

Magnetic field vs. tunneling magnetodielectric (TMD) ratio at f = 5.0 MHz and x = 0.23. The solid line presents the normalized magnetization (M/M850k)2, where M850k is the magnetization at H = 850 kA/m. Fullsize Image
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