Monte Carlo simulation of surface anisotropy in La2/3Ca1/3MnO3 nanoparticles

被引：6
作者：
Restrepo-Parra, E. [1 ]
Orozco-Hernandez, G. [1 ]
Riano-Rojas, J. C. [1 ]
机构：
[1] Univ Nacl Colombia, PCM Computat Applicat, Manizales 127, Colombia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2013年 / 344卷 / 344期
关键词：
Nanoparticle; Magnetization; Diameter; Anisotropy; Manganite;
D O I：
10.1016/j.jmmm.2013.05.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Using Monte Carlo methods, the thermally activated magnetic property switching of nanoparticles was studied. The analysis was applied to nanoparticles of La2/3Ca1/3MnO3, and the results were compared with bulk material properties. The model is based on a three-dimensional classical Heisenberg-Hamiltonian involving the presence of Mn3+eg, Mn3+eg' and Mn4+ ions and their nearest-neighbor interactions. For this model, simple cubic lattice samples were employed. Nanoparticles with diameters between 2.316 nm (6 ions) and 10.422 nm (27 ions) were simulated. A shift in the transition temperature (T-c=260 K) was observed with respect to the bulk value. This shift is due to the surface anisotropy, which can be explained by the finite size scaling theory. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：44 / 48
页数：5
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