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Multiple magnetic scattering in small-angle neutron scattering of Nd–Fe–B nanocrystalline magnet

Scientific Reports

2016年6月20日(月)

doi:10.1038/srep28167
( Tetsuro Ueno, Kotaro Saito, Masao Yano, Masaaki Ito, Tetsuya Shoji, Noritsugu Sakuma, Akira Kato, Akira Manabe, Ai Hashimoto, Elliot P. Gilbert, Uwe Keiderling & Kanta Ono )

Abstract

We have investigated the influence of multiple scattering on the magnetic small-angle neutron scattering (SANS) from a Nd–Fe–B nanocrystalline magnet. We performed sample-thickness- and neutron-wavelength-dependent SANS measurements, and observed the scattering vector dependence of the multiple magnetic scattering. It is revealed that significant multiple scattering exists in the magnetic scattering rather than the nuclear scattering of Nd–Fe–B nanocrystalline magnet. It is considered that the mean free path of the neutrons for magnetic scattering is rather short in Nd–Fe–B magnets. We analysed the SANS data by the phenomenological magnetic correlation model considering the magnetic microstructures and obtained the microstructural parameters.

その他特記事項

This work was supported by the Elements Strategy Initiative Center for Magnetic Materials (ESICMM) under the outsourcing project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The sample preparation was performed under the future pioneering program “Development of magnetic material technology for high-efficiency motors” commissioned by the New Energy and Industrial Technology Development Organization (NEDO), Japan. The SANS experiments were performed at ANSTO as a proposal P4140 and at HZB as a proposal No. 14100745-ST. The authors thank Dr. Hiroshi Tsukahara for fruitful discussion.



研究活動

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