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Constrained Monte Carlo method and calculation of the temperature dependence of magnetic anisotropy

机译:约束蒙特卡罗方法及磁各向异性温度相关性的计算

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摘要

We introduce a constrained Monte Carlo method which allows us to traverse the phase space of a classical spin system while fixing the magnetization direction. Subsequently we show the method's capability to model the temperature dependence of magnetic anisotropy, and for bulk uniaxial and cubic anisotropies we recover the low-temperature Callen-Callen power laws in M. We also calculate the temperature scaling of the two-ion anisotropy in Ll_0 FePt, and recover the experimentally observed M~(2.1) scaling. The method is newly applied to evaluate the temperature-dependent effective anisotropy in the presence of the Nee! surface anisotropy in thin films with different easy-axis configurations. In systems having different surface and bulk easy axes, we show the capability to model the temperature-induced reorientation transition. The intrinsic surface anisotropy is found to follow a linear temperature behavior in a large range of temperatures.
机译:我们介绍了一种受约束的蒙特卡洛方法,该方法允许我们在固定磁化方向的同时遍历经典自旋系统的相空间。随后,我们展示了该方法能够建模磁各向异性的温度依赖性的能力,对于块状单轴和立方各向异性,我们恢复了M中的低温Callen-Callen幂定律。我们还计算了Ll_0中两离子各向异性的温度标度FePt,并恢复实验观察到的M〜(2.1)结垢。该方法是新近应用于在Nee!的存在下评估与温度有关的有效各向异性的方法。具有不同易轴构型的薄膜的表面各向异性。在具有不同的表面轴和块体易轴的系统中,我们展示了对温度引起的重取向转变建模的能力。发现本征表面各向异性在大温度范围内遵循线性温度行为。

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