Size-dependent exchange bias in La(0.25)Ca(0.75)MnO(3) nanoparticles

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	Size-dependent exchange bias in La(0.25)Ca(0.75)MnO(3) nanoparticles
	X. H. Huang; J. F. Ding; G. Q. Zhang; Y. Hou; Y. P. Yao; X. G. Li
	2008
发表期刊	Physical Review B
ISSN	1098-0121
卷号	78 期号:22
摘要	Exchange bias phenomena are observed in La(0.25)Ca(0.75)MnO(3) nanoparticles with average sizes ranging from 40 to 1000 nm. It is found that the magnetic hysteresis loops display horizontal and vertical shifts in field-cooled processes. The variations of the exchange bias field (H(EB)) and the coercivity (H(c)) with particle size follow nonmonotonic dependencies and show maxima for particles with diameter around 80 nm at T=5 K, which can be mainly ascribed to the changes in uncompensated surface spins with nanoparticle size. The peak position for H(c) shifts to larger particle size at higher temperature while that for H(EB) is unconspicuous. The linear relationship between H(EB) and vertical magnetization shift (M(EB)) further indicates that the characteristics of uncompensated spins play an important role in the variations of H(EB) for the manganite.
部门归属	[huang, x. h.] univ sci & technol china, dept phys, hefei natl lab phys sci microscale, hefei 230026, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;huang, xh (reprint author), univ sci & technol china, dept phys, hefei natl lab phys sci microscale, hefei 230026, peoples r china;lixg@ustc.edu.cn
关键词	Calcium Compounds Coercive Force Exchange Interactions (Electron) Lanthanum Compounds Magnetic Cooling Magnetic Hysteresis Magnetic Particles Nanoparticles Particle Size Random-field Model Cluster-glass Spin-glass Anisotropy La0.5sr0.5coo3 Crossover Mechanism Behavior State
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32833
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. Huang,J. F. Ding,G. Q. Zhang,et al. Size-dependent exchange bias in La(0.25)Ca(0.75)MnO(3) nanoparticles[J]. Physical Review B,2008,78(22).
APA	X. H. Huang,J. F. Ding,G. Q. Zhang,Y. Hou,Y. P. Yao,&X. G. Li.(2008).Size-dependent exchange bias in La(0.25)Ca(0.75)MnO(3) nanoparticles.Physical Review B,78(22).
MLA	X. H. Huang,et al."Size-dependent exchange bias in La(0.25)Ca(0.75)MnO(3) nanoparticles".Physical Review B 78.22(2008).