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Role of longitudinal fluctuations in L1_0 FePt

机译：L1_0纵向波动的作用

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摘要

L1(0) FePt is a technologically important material for a range of novel data storage applications. In the ordered FePt structure the normally nonmagnetic Pt ion acquires a magnetic moment, which depends on the local field originating from the neighboring Fe atoms. In this work a model of FePt is constructed in which the induced Pt moment is simulated by using combined longitudinal and rotational spin dynamics. The model is parameterized to include a linear variation of the moment with the exchange field, so that at the Pt site the magnetic moment depends on the Fe ordering. The Curie temperature of FePt is calculated and agrees well with similar models that incorporate the Pt dynamics through an effective Fe-only Hamiltonian. By computing the dynamic correlation function the anisotropy field and the Gilbert damping are extracted over a range of temperatures. The anisotropy exhibits a power-law dependence on the magnetization with exponent n approximate to 2.1. This agrees well with what was observed experimentally, and it is obtained without including a two-ion anisotropy term as in other approaches. Our work shows that incorporating longitudinal fluctuations into spin dynamics calculations is crucial for understanding the properties of materials with induced moments.
机译：L1（0）FEST是一系列新型数据存储应用的技术上重要的材料。在有序的扫描结构中，通常非磁性Pt离子获取磁矩，这取决于源自相邻Fe原子的局部场。在这项工作中，构造了一种备用术的模型，其中通过使用组合的纵向和旋转自旋动力学来模拟诱导的PT力矩。该模型被参数化以包括具有交换字段的时刻的线性变化，因此在PT站点处磁矩取决于FE排序。 Rept的静脉温度计算并与类似模型进行良好，通过实用的Fe-op-Philtonian掺入PT动态。通过计算动态相关函数，在一系列温度范围内提取各向异性场和吉尔伯特阻尼。各向异性表现出幂律依赖于指数n近似为2.1的磁化。这与实验观察的内容很好，并且在不包括双离子各向异性术语的情况下，如其他方法所获得的。我们的工作表明，将纵向波动纳入旋转动力学计算对于了解具有诱导时刻的材料的性质至关重要。

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