Magnetic properties of MnAs nanocrystals embedded in GaAs

被引:6
作者
Kwiatkowski, A. [1 ]
Wasik, D. [1 ]
Dluzewski, P. [2 ]
Borysiuk, J. [1 ,3 ]
Kaminska, M. [1 ]
Twardowski, A. [1 ]
Sadowski, J. [2 ,4 ]
机构
[1] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
[2] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[3] Inst Elect Mat Technol, PL-01919 Warsaw, Poland
[4] Lund Univ, Max Lab, S-22100 Lund, Sweden
关键词
Nanocomposite; Superparamagnet; Nanocrystal; Nanoprecipitate; DYNAMICS;
D O I
10.1016/j.jmmm.2009.04.033
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A phenomenological model for explaining the magnetic properties of MnAs nanocrystals embedded in GaAs is proposed. It is shown that experimental data of DC magnetization as a function of temperature, obtained according to zero-field-cooled and field-cooled protocols, can be understood assuming a transition of the system from a low temperature state in which very slow dynamics is observed(frozen state) to a high-temperature state in which dynamics is fast(quasi superparamagnetic state). (C) 2009 Elsevier B. V. All rights reserved.
引用
收藏
页码:2788 / 2791
页数:4
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