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

W. B. Cui; H. Sepehri-Amin; Y. K. Takahashi; K. Hono

doi:10.1016/j.actamat.2014.10.008

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

W. B. Cui, H. Sepehri-Amin, Y. K. Takahashi, K. Hono

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

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.

Original language	English
Pages (from-to)	405-412
Number of pages	8
Journal	Acta Materialia
Volume	84
DOIs	https://doi.org/10.1016/j.actamat.2014.10.008
Publication status	Published - 2015 Feb 1
Externally published	Yes

Keywords

Coercivity
Exchange coupling
Maximum energy product
Nanocomposite magnet
Permanent magnet

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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title = "Hard magnetic properties of spacer-layer-tuned NdFeB/Ta/Fe nanocomposite films",

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.",

keywords = "Coercivity, Exchange coupling, Maximum energy product, Nanocomposite magnet, Permanent magnet",

author = "Cui, {W. B.} and H. Sepehri-Amin and Takahashi, {Y. K.} and K. Hono",

year = "2015",

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doi = "10.1016/j.actamat.2014.10.008",

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journal = "Acta Materialia",

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TY - JOUR

T1 - Hard magnetic properties of spacer-layer-tuned NdFeB/Ta/Fe nanocomposite films

AU - Cui, W. B.

AU - Sepehri-Amin, H.

AU - Takahashi, Y. K.

AU - Hono, K.

PY - 2015/2/1

Y1 - 2015/2/1

N2 - 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.

AB - 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.

KW - Coercivity

KW - Exchange coupling

KW - Maximum energy product

KW - Nanocomposite magnet

KW - Permanent magnet

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