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Small-angle polarized neutron scattering study of spherical Fe$$_{16}$$N$$_{2}$$ nano-particles for magnetic recording tape

磁気記録テープ用Fe$$_{16}$$N$$_{2}$$ナノ粒子の偏極中性子小角散乱研究

奥 隆之   ; 菊地 隆之*; 篠原 武尚   ; 鈴木 淳市; 石井 佑弥*; 武田 全康  ; 加倉井 和久; 佐々木 勇治*; 岸本 幹雄*; 横山 淳*; 西原 美一*

Oku, Takayuki; Kikuchi, Takayuki*; Shinohara, Takenao; Suzuki, Junichi; Ishii, Yuya*; Takeda, Masayasu; Kakurai, Kazuhisa; Sasaki, Yuji*; Kishimoto, Mikio*; Yokoyama, Makoto*; Nishihara, Yoshikazu*

Fe$$_{16}$$N$$_{2}$$ナノ磁性微粒子の磁気モーメントを偏極中性子粉末回折実験により測定した。この窒化鉄微粒子は高密度磁気テープのために開発されたもので、この物質の酸化を防ぐために非磁性の保護膜により覆われている。偏極中性子回折の磁気-核散乱干渉項を測定することで、磁性を持つ窒化鉄の異なる鉄サイトのモーメントを評価することができた。J-PARCにおける偏極中性子、大強度粉末回折装置と超高パルス磁場の組合せで可能になる粉末回折磁性研究の展望も述べる予定である。

The microscopic determination of the magnetic moment in the Fe$$_{16}$$N$$_{2}$$ nano-particles by means of polarized neutron diffraction experiment is reported. These particles had been developed by industrial researchers for use in high-density magnetic tape, and the particles were coated with proprietary nonmagnetic material. Polarized neutrons were used to measure the magnetic-nuclear interference contributions and, given the known crystal structure, the detailed analysis allowed to determine the magnetic moments on the different Fe-sites. The future perspectives of this technique using the high-intensity powder instrument in combination with pulsed magnetic high-field at J-PARC including the possible industrial application is discussed.

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パーセンタイル:35.60

分野:Physics, Condensed Matter

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