کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8158103 | 1524876 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Monte Carlo simulation of surface anisotropy in La2/3Ca1/3MnO3 nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
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+egâ² and Mn4+ ions and their nearest-neighbor interactions. For this model, simple cubic lattice samples were employed. Nanoparticles with diameters between 2.316Â nm (6 ions) and 10.422Â nm (27 ions) were simulated. A shift in the transition temperature (Tc=260Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 344, October 2013, Pages 44-48
Journal: Journal of Magnetism and Magnetic Materials - Volume 344, October 2013, Pages 44-48
نویسندگان
E. Restrepo-Parra, G. Orozco-Hernández, J.C. Riaño-Rojas,