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首页> 外文期刊>Physica, B. Condensed Matter >Monte Carlo study of magnetic properties for the mixed spin-3/2 and spin-1 ferrimagnetic nanoparticles
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Monte Carlo study of magnetic properties for the mixed spin-3/2 and spin-1 ferrimagnetic nanoparticles

机译：自旋3/2和自旋1亚铁磁性纳米粒子的磁性的蒙特卡洛研究

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摘要

Based on Monte Carlo simulation, the magnetic properties of the ferrimagnetic nanoparticles on a body-centered-cubic lattice are investigated. The particle is described by a mixed-spin Heisenberg model in which S=3/2 and sigma=1 are distributed in the two interpenetrating square sublattices. It is found that no compensation point occurs at finite temperature when only the nearest-neighbor interaction between S-sigma spins is included. But, when the next-nearest-neighbor interaction between sigma-sigma spins is taken into account and exceeds a threshold value that depends on the other parameters such as the next-nearest-neighbor interaction between S-S spins and single-ion anisotropies in the Hamiltonian, a compensation point can appear. With the appropriate order parameter which is constructed to characterize the compensation behavior clearly, a variety of phase diagrams including the finite-size effect are derived and discussed.
机译：基于蒙特卡罗模拟，研究了体心立方晶格上的亚铁磁性纳米粒子的磁性。用混合旋转海森堡模型描述粒子，其中S = 3/2和sigma = 1分布在两个互穿的正方形子格中。发现仅包括S-sigma自旋之间的最近邻相互作用时，在有限温度下不会出现补偿点。但是，当考虑到sigma-sigma自旋之间的下一个近邻相互作用并超过阈值时，该阈值取决于其他参数，例如SS自旋与哈密顿量中的单离子各向异性之间的下一个近邻相互作用，可能会出现一个补偿点。通过构造适当的阶跃参数来清楚地描述补偿行为，得出并讨论了包括有限尺寸效应在内的各种相位图。

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