Transmission electron microscopy study on Nd-rich phase at the surface of Nd2Fe14B phase in Nd-Fe-B films

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3 Citations (Scopus)

Abstract

This study provides the abundance ratio of Nd(-O) phases at the interface of Nd2Fe14B/Nd(-O) in Nd-Fe-B films with different coercivity values. The crystal structure and morphology of the Nd 2Fe14B/Nd (-O) interface were investigated by transmission electron microscopy. In the Nd-Fe-B film annealed at 350°C, the coercivity of which decreases to around 20% of the value of as-deposited film, the hcp Nd2O3 phase are existed dominantly at the surface of Nd2Fe14B phase with c-plane and non-c-plane. (In this study, the planes of Nd2Fe14B with the c-axis perpendicular or non-perpendicular to the interface are described as c-plane and non-c-plane, respectively.) On the contrary, C-Nd2O3 and amorphous phases, which were metastable phases, existed dominantly in the film after annealing at 650°C, the coercivity of which recovers to the same level of as-deposited film. The abundance ratio of the metastable phases tends to be higher at the surface of non-c-plane than at the surface of c-plane of Nd 2Fe14B phase.

Original languageEnglish
Article number6028076
Pages (from-to)3273-3275
Number of pages3
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Coercivity
  • Nd oxide
  • Nd-Fe-B films
  • TEM
  • microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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