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题名: Structure, magnetization, and low-temperature spin dynamic behavior of zincblende Mn-rich Mn(Ga)As nanoclusters embedded in GaAs
作者: Wang WZ;  Deng JJ;  Lu J;  Sun BQ;  Wu XG;  Zhao JH
发表日期: 2009
摘要: We have fabricated a set of samples of zincblende Mn-rich Mn(Ga)As clusters embedded in GaAs matrices by annealing (Ga,Mn)As films with different nominal Mn content at 650 degrees C. For the samples with Mn content no more than 4.5%, the Curie temperature reaches nearly 360 K. However, when Mn content is higher than 5.4%, the samples exhibit a spin-glass-like behavior. We suggest that these different magnetic properties are caused by the competing result of dipolar and Ruderman-Kittel-Kasuya-Yosida interaction among clusters. The low-temperature spin dynamic behavior, especially the relaxation effect, shows the extreme creeping effect which is reflected by the time constant tau of similar to 10(11) s at 10 K. We explain this phenomenon by the hierarchical model based on the mean-field approach. We also explain the memory effect by the relationship between the correlation function and the susceptibility.
KOS主题词: Rapid thermal processing;  Heat treatment;  Curie temperature;  Ferromagnetic materials;  Gallium arsenide;  Amorphous semiconductors;  Magnetic permeability;  demagnetisation;  Manganese compounds;  Nanotechnology;  Nanostructured materials;  exchange interactions (electron);  semiconductor epitaxial layers;  Diluted magnetic semiconductors;  spin dynamics
刊名: JOURNAL OF APPLIED PHYSICS
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Wang WZ ; Deng JJ ; Lu J ; Sun BQ ; Wu XG ; Zhao JH .Structure, magnetization, and low-temperature spin dynamic behavior of zincblende Mn-rich Mn(Ga)As nanoclusters embedded in GaAs ,JOURNAL OF APPLIED PHYSICS,2009 ,105(5):Art. No. 053912
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