Confirmation of hard magnetic L10 FeNi phase precipitated in fenisibpcu alloy by anomalous X-ray diffraction

Parmanand Sharma, Satoshi Okamoto, Hiroo Tajiri, Kazuhisa Sato, Yan Zhang, Osamu Kitakami, Akihiro Makino

研究成果: Article査読

1 被引用数 (Scopus)

抄録

There is a growing interest in the development of rare-earth element-free hard magnets. The L10 FeNi phase found in Fe-based meteorites is promising based on its high-magnetocrystalline anisotropy and saturation magnetization. Not only the production, but also the characterization of L10 FeNi phase is challenging due to similar X-ray scattering factors of Fe and Ni. Here, we report on the confirmation of L10 FeNi phase precipitated in a multi-phase FeNiSiBPCu alloy by anomalous X-ray diffraction (AXRD). This is a powerful technique, which can differentiate between ordered and disordered phases along with the elements present in a phase. We measured integrated X-ray intensity with energy near the Fe (7-7.2 keV) and Ni (8.25-8.4 keV) absorption edges for superlattice and fundamental reflections of L10 FeNi. A drastic change in integrated intensity with energy of X-ray was observed. Increase in intensity around superlattice reflection at Ni-absorption edge clearly confirms the presence of a chemically ordered L10 FeNi phase, but the results obtained at Fe edge are surprising. The analysis of AXRD results suggested that (110) diffraction peak of Fe2B phase overlaps with (001) of L10 FeNi. Understanding gained from AXRD results also allows us to estimate the long-range order parameter (S) from X-ray diffraction measurements.

本文言語English
論文番号8388725
ジャーナルIEEE Transactions on Magnetics
54
11
DOI
出版ステータスPublished - 2018 11

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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