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Polarized neutron diffractometry of Fe$${}_{16}$$N$${}_{2}$$ nanoparticles

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

Magnetic recording tape is widely used for a massive data storage with high reliability, and further increase of capacity, the recording density, is requested by IT organizations. The needle-shaped ferromagnetic metals has been used for the recording media. However, it is necessary to make the media a small and spherical shape to increase the recording density. We have performed the polarized neutron diffraction measurements of Fe$$_{16}$$N$$_{2}$$ round-shape nanoparticles, and determined the saturation magnetic moments and averaged core size of Fe$$_{16}$$N$$_{2}$$ nanoparticles covered by a laminate layer.

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