Orbital magnetic moment and coercivity of SiO-coated FePt nanoparticles studied by X-ray magnetic circular dichroism

Takahashi, Yukio*; Kadono, Toshiharu*; Yamamoto, Shimpei*; Singh, V. R.*; Verma, V.*; Ishigami, Keisuke*; Shibata, Goro*; Harano, Takayuki*; Takeda, Yukiharu ; Okane, Tetsuo ; Saito, Yuji ; Yamagami, Hiroshi; Takano, Mikio*; Fujimori, Atsushi

We have investigated the spin and orbital magnetic moments of Fe in FePt nanoparticles in the $L1_{0}$ -ordered phase coated with SiO by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements at the Fe $L_{2,3}$ absorption edges. The magnetic coercivity (H $_{c}$ ) was found to be as large as 1.8 T at room temperature, 3 times larger than the thin film value and 50 times larger than that of the gas phase condensed nanoparticles. The hysteresis curve is well explained by the Stoner-Wohlfarth model for noninteracting single-domain nanoparticles with the H $_{c}$ distributed from 1 to 5 T.

Language	:	English
Journal	:	Physical Review B
Volume	:	90
Number	:	2
Pages	:	p.024423_1 - 024423_5
Publication Year/Month	:	2014/07
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PDF	:	AA2015-0417.pdf:0.45MB
Paper URL	:	https://doi.org/10.1103/PhysRevB.90.024423
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Article of JAEA R&D Review	:
Cooperating Institute	:	東京大学

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Registration No. : AA20150417
JAEA Abstracts No. : 43001332
Paper Submission No. : 16420

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