High-frequency ferromagnetic resonance on ultrafine cobalt particles

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	High-frequency ferromagnetic resonance on ultrafine cobalt particles
	Respaud M ; Goiran M ; Broto JM ; Yang FH ; Ould-Ely T ; Amiens C ; Chaudret B
刊名	physical review b
	1999
卷号	59 期号:6 页码:r3934-r3937
关键词	MAGNETIC-PROPERTIES RELAXATION-TIME IRON CLUSTERS NANOPARTICLES SILICA
ISSN号	0163-1829
通讯作者	respaud m,inst natl sci appl complexe sci rangueil,phys mat condensee lab,serv natl champs magnet pulses,f-31077 toulouse,france.
中文摘要	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.
学科主题	半导体物理
收录类别	SCI
语种	英语
公开日期	2010-08-12
内容类型	期刊论文
源URL	[http://ir.semi.ac.cn/handle/172111/12990]
专题	半导体研究所_中国科学院半导体研究所（2009年前）
推荐引用方式 GB/T 7714	Respaud M,Goiran M,Broto JM,et al. High-frequency ferromagnetic resonance on ultrafine cobalt particles[J]. physical review b,1999,59(6):r3934-r3937.
APA	Respaud M.,Goiran M.,Broto JM.,Yang FH.,Ould-Ely T.,...&Chaudret B.(1999).High-frequency ferromagnetic resonance on ultrafine cobalt particles.physical review b,59(6),r3934-r3937.
MLA	Respaud M,et al."High-frequency ferromagnetic resonance on ultrafine cobalt particles".physical review b 59.6(1999):r3934-r3937.