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题名: High-frequency ferromagnetic resonance on ultrafine cobalt particles
作者: Respaud M;  Goiran M;  Broto JM;  Yang FH;  Ould-Ely T;  Amiens C;  Chaudret B
发表日期: 1999
摘要: We report on high-frequency (300-700 GHz) ferromagnetic resonance (HF-FMR) measurements on cobalt superparamagnetic particles with strong uniaxial effective anisotropy. We derive the dynamical susceptibility of the system on the basis of an independent-grain model by using a rectangular approach. Numerical simulations give typical line shapes depending on the anisotropy, the gyromagnetic ratio, and the damping constant. HF-FMR experiments have been performed on two systems of ultrafine cobalt particles of different sizes with a mean number of atoms per particles of 150 +/- 20 and 310 +/- 20. In both systems, the magnetic anisotropy is found to be enhanced compared to the bulk value, and increases as the particle size decreases, in accordance with previous determinations from magnetization measurements. Although no size effect has been observed on the gyromagnetic ratio, the transverse relaxation time is two orders of magnitude smaller than the bulk value indicating strong damping effects, possibly originating from surface spin disorders.
KOS主题词: Magnetic properties;  RELAXATION TIME;  Iron;  CLUSTERS;  Nanoparticles;  Silica
刊名: PHYSICAL REVIEW B
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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Respaud M; Goiran M; Broto JM; Yang FH; Ould-Ely T; Amiens C; Chaudret B .High-frequency ferromagnetic resonance on ultrafine cobalt particles ,PHYSICAL REVIEW B,1999,59(6):R3934-R3937
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