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A Study of diameter dependence of magnetic moments on Fe$$_{16}$$N$$_{2}$$ nanoparticles by polarized neutrons diffraction

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

The needle-shaped ferromagnetic metals are often used for the magnetic recording tapes. It is, however necessary to make small and spherical shape to increase the recording capacity and density. Recently, Fe$$_{16}$$N$$_2$$ round nanoparticles with diameter of 20 nm were produced by Hitachi Maxell, Ltd.. But it is difficult to obtain exact magnitude by conventional magnetometer due to the laminated layer around the Fe$$_{16}$$N$$_2$$. We performed polarized neutron diffraction measurements to determine the net magnetization. The averaged diameter of samples were used in these experiments are approximately 19, 18, 17 and 15 nm. The triple-axis neutron spectrometer, TAS-1, installed at JRR-3 was used in this experiment.



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