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偏極中性子粉末回折を用いた磁性材料研究の可能性

Possibility of magnetic materials research by means of polarized neutron powder diffraction

加倉井 和久; 武田 全康  ; 石井 佑弥; 老谷 聖樹; 佐々木 勇治*; 岸本 幹雄*; 横山 淳*; 西原 美一*

Kakurai, Kazuhisa; Takeda, Masayasu; Ishii, Yuya; Oitani, Seiki; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; Nishihara, Yoshikazu*

偏極中性子を用いた磁気モーメント密度分布の測定はこれまでもmixed valence系や分子磁性研究の分野で活用されてきた。しかし、偏極中性子ビーム強度が弱いためにほとんどの実験が単結晶を用いた実験であった。しかし、近い将来パルス中性子源の大強度粉末中性子回折装置における偏極中性子回折実験を実現させれば、より広範囲な磁気物質群に対して磁気モーメント密度分布の測定が可能になり、産業利用を視野に入れた磁気材料研究のさらなる進展が期待できる。この講演では茨城県中性子利用促進研究会・ナノ磁性材料研究会のテスト実験として行われた窒化鉄や純鉄超微粒子磁性体の粉末偏極中性子回折実験結果を例にしてこの手法の可能性を検討する。

Magnetization distribution maps deduced from the measurement of polarization dependent cross-sections have provided unique information in understanding of the detailed electronic configurations in mixed valence materials and molecular magnets. Because of the limited neutron flux the method has been mostly applied to single crystal studies. In the advent of strong pulsed neutron source with intense high resolution powder diffractomer the magnetization distribution measurements by means of polarized neutron powder diffraction can become common place. The introduction of the high magnetic field may extend the applicability of the method to materials requiring high saturation field. In this lecture the polarized neutron powder diffraction experiment on Fe$$_{16}$$N$$_{2}$$ and $$alpha$$-Fe fine particles performed in the frame work of "Ibaraki Prefecture Neutron Utilization Working Subgroup on nano-magnetic materials" will be presented and the possibility of the method will be discussed.

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