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Kakurai, Kazuhisa; Takeda, Masayasu; Sasaki, Yuji*; Awano, Hiroyuki*
no journal, ,
We performed polarized neutron powder diffraction test experiment on magnetic recording material FeN nano-particles. The determination of the magnetic moment in the laminated nano-particles using macroscopic measurements, such as magnetization, is difficult, because of the unknown average thickness of the coating materials. Flipping ratio measurement using polarized neutron may determine the magnetization of the core magnetic material directly and can thus provide unique information to improve the magnetic characteristics of the core material. The results of the test experiments on two different samples with different macroscopic magnetization values are reported. It is concluded, that the magnetic moments of the core FeN material in these samples are identical and hence the difference in the macroscopic measurements must be attributed to the different average thickness of the coating materials.
Kakurai, Kazuhisa; Takeda, Masayasu; Nishihara, Yoshikazu*; Sasaki, Yuji*; Kishimoto, Mikio*; Awano, Hiroyuki*
no journal, ,
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 Fe16N2 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 at J-PARC will be discussed.
Hagiya, Hiroyuki; Oku, Takayuki; Kira, Hiroshi; Shinohara, Takenao; Suzuki, Junichi; Takeda, Masayasu; Kakurai, Kazuhisa; Yokoyama, Makoto*; Nishihara, Yoshikazu*; Oba, Yojiro*; et al.
no journal, ,
no abstracts in English
Hagiya, Hiroyuki; Oku, Takayuki; Kira, Hiroshi; Shinohara, Takenao; Suzuki, Junichi; Kakurai, Kazuhisa; Yokoyama, Makoto*; Nishihara, Yoshikazu*; Mamiya, Hiroaki*; Oba, Yojiro*; et al.
no journal, ,
no abstracts in English