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Hard magnetic properties of spacer-layer-tuned NdFeB/Ta/Fe nanocomposite films

Acta Materialia

2014年11月26日(水)
(2014.11.26 更新)

Acta Materialia ( Vol84, 1 February 2015, P.405–412 )
W.B. Cui, H. Sepehri-Amin, Y.K. Takahashi, K. Hono

Abstract

Anisotropic Ti(20 nm)/NdFeB(100 nm)Nd(10 nm)/Ta(x nm)/Fe(y nm)/Ti(20 nm) multilayer films
were prepared, and the magnetic coupling mechanism between soft-/hard-magnetic (SM/HM)
layers were systematically studied in order to understand the potential of anisotropic SM/HM
nanocomposite magnets. Recoil behaviors were also investigated in films with various thicknesses
of Fe layer. From experimental results, the roles of exchange coupling and magnetostatic coupling
in the demagnetization process were clarified, which was further supported by micromagnetic
simulations. For different thicknesses of Ta spacer layer, the demagnetization process was
analyzed, and the coupling energy was estimated. This work also indicated that, using the proper
thickness of Ta spacer layer, the (BH)max can be enhanced in the SM/HM nanocomposite
magnets by a combination of weakened exchange coupling and magnetostatic coupling.

その他特記事項

This research was partly supported by JST, CREST.


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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