2020年10月7日
Large magnetodielectric effect based on spin-dependent charge transfer in metal–insulator type Co-(BaF2) nanogranular films
Journal of Applied Physics
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- 巻
- 128
- 号
- 13
- 開始ページ
- 133904
- 終了ページ
- 133904
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/5.0021636
- 出版者・発行元
- AIP Publishing
© 2020 Author(s). Cobalt-metal-fluoride nanogranular films exhibit high electrical resistivity (ρ) and high permittivity (ϵ′) as well as high magnetic moments, making them potentially suitable for applications in low power magnetoelectronic devices at a high-frequency range. Here, we present the DC/AC magnetoelectric effect of high-ρ Cox-(BaF2)1 - x nanogranular films that are constituted of Co nanogranules of about 2 nm in diameter in an insulating BaF2 crystal. Under the application of magnetic field (H), we observed the ρ variations (Δρ/ρ0) of 2.0%-5.9% for x ranging 0.19-0.54 and the ϵ′ variations (Δϵ/ ϵ 0 ′) of 0.7%-6.0% for x ranging 0.19-0.42, respectively. These magnetically controllable ρ and ϵ′ are realized based on the spin-dependent quantum-mechanical charge transfer. The Cox-(BaF2)1 - x film for x = 0.42 possesses high ρ, while remaining in a notably high Δϵ/ ϵ 0 ′ of 6% at a megahertz frequency range. This study demonstrates a candidate of high-resistive magnetoelectric nanogranular films, which may bring prosperous applications in high-frequency magnetoelectric devices with low power consumption.
- リンク情報
- ID情報
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- DOI : 10.1063/5.0021636
- ISSN : 0021-8979
- eISSN : 1089-7550
- SCOPUS ID : 85092374055