Monte Carlo simulation of surface anisotropy in La(2/3)Ca(1/3)MnO(3) nanoparticles

Using Monte Carlo methods, the thermally activated magnetic property switching of nanoparticles was studied. The analysis was applied to nanoparticles of La(2/3)Ca(1/3)MnO(3), and the results were compared with bulk material properties. The model is based on a three-dimensional classical Heisenberg-...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 344; pp. 44 - 48
Main Authors Restrepo-Parra, E, Orozco-Hernandez, G, Riano-Rojas, J C
Format Journal Article
LanguageEnglish
Published 01.10.2013
Subjects
Anisotropy
Computer simulation
Magnetic properties
Mathematical analysis
Monte Carlo methods
Nanoparticles
Three dimensional
Transition temperature
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Summary:Using Monte Carlo methods, the thermally activated magnetic property switching of nanoparticles was studied. The analysis was applied to nanoparticles of La(2/3)Ca(1/3)MnO(3), and the results were compared with bulk material properties. The model is based on a three-dimensional classical Heisenberg-Hamiltonian involving the presence of Mn(3+eg), Mn(3+eg') and Mn(4+) 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.
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ISSN:0304-8853