Constrained Monte Carlo method and calculation of the temperature dependence of magnetic anisotropy
Constrained Monte Carlo method and calculation of the temperature dependence of magnetic anisotropy
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DOI：
10.1103/physrevb.82.054415
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发表时间：
2010-08-11
影响因子：
3.7
通讯作者：
Nowak, U.
中科院分区：
文献类型：
--
作者：
Asselin, P.;Evans, R. F. L.;Nowak, U.
我们介绍了一种约束蒙特卡罗方法，它允许我们遍历一个经典的自旋系统的相空间，而固定的磁化方向。随后，我们展示了该方法模拟磁各向异性的温度依赖性的能力，并且对于体单轴和立方各向异性，我们恢复了M.我们还计算了L1（0）FePt中双离子各向异性的温度标度，并恢复了实验观察到的M-2.1标度。该方法是新应用于评估的温度依赖性的有效各向异性的存在下的尼尔表面各向异性的薄膜具有不同的易轴配置。在具有不同的表面和体积易轴的系统中，我们展示了模拟温度诱导的重取向转变的能力。本征表面各向异性被发现遵循一个线性的温度行为在一个大的温度范围内。
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 L1(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 Neel 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.