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Exchange-interaction by the induced growth of the soft phase on the extreme hard phase

AIP Advance 8.105036 (2018)

2018年10月30日(火)

Hoju Kang, Satoshi Sugimoto ( https://doi.org/10.1063/1.5042626 )

Abstract

 The significant change is reported in interparticle interaction for nanocomposites of e-Fe2O3 and FeCo as the grain size of the soft phase (FeCo) increases upon annealing. It undergoes a transition from the dipolar interaction dominant regime into the exchange-interaction dominant regime, starting from the crystalline soft phase size of 9.6 nm, which is coincident with the theoretical critical dimension. The effective anisotropy increases exponentially as the ordering dimension of the soft phase increases with the ratio between hard and soft phases stays constant, causing a delay in the demagnetization process. The emerged exchange-interaction is understood by the induced growth of the soft phase on the extreme hard phase.

その他特記事項

 This work was partially supported by the Elements Strategy Initiative Center for Magnetic Materials (ESICMM) under the outsourcing project of MEXT, Japan. The authors would like to thank assistant professor Masashi Matsuura in Tohoku University for the technical support.


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文部科学省
元素戦略プロジェクト(活動紹介)
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元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合