Influence of the shapes on the magnetic and electrical transport properties of La2/3Ca1/3MnO3 nanoparticles
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In this work, the role of the geometrical shape, using the Minkowski’s metrics, upon the temperature dependence of the magnetic and electrical transport properties of La2/3Ca1/3MnO3 nanoparticles was carried out. We considered a set of small particles with different shapes containing approximately the same amount of Mn ions (~6500) and distributed as a simple cubic structure in agreement with the manganites perovskite structure. The model is based on the standard Monte Carlo–Metropolis method and the classical Heisenberg Hamiltonian involving nearest magnetic neighbors interactions. Results dealing with the dependence of the Curie temperature for nanoparticles is lower than material in bulk. Moreover, magnetization and magnetic susceptibility as a function of the metric for some field cooled values. As the field cooled increased the transition temperature T C increased. On the other hand, low temperature coercive force and resistivity with the shape of the nanoparticles, having different metric parameters, are present and discussed.
KeywordsManganite Coercive Force Magnetization Reversal Magnetocrystalline Anisotropy Surface Anisotropy
The authors gratefully acknowledge the financial support of Dirección Nacional de Investigaciones of Universidad Nacional during the course of this research, under project 7785. This work was also supported in part by the GES and GICM Sustainability projects, the IN565CE, IN576CE, and IN578CE projects of the Antioquia University. One of the authors (J.R) wants also to acknowledge to the Spanish Education Ministry for the sabbatical year Grant SB2009-0210.
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