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Orbital magnetic moment and coercivity of SiO$$_2$$-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$$_2$$ 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.

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Category:Materials Science, Multidisciplinary

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