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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 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 languageEnglish
Pages (from-to)405-412
Number of pages8
JournalActa Materialia
Volume84
DOIs
Publication statusPublished - 2015 Feb 1
Externally publishedYes

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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