纯各向异性和混合各向异性体系中双离子各向异性的温度标度
Temperature scaling of two-ion anisotropy in pure and mixed anisotropy systems
摘要：
磁各向异性在磁性材料的信息技术应用中起着至关重要的作用，它提供了一种在存在热波动的情况下保持磁状态长期稳定的手段。各向异性由来自晶体结构的单离子贡献和归因于磁性原子之间的交换相互作用的双离子项组成。缺乏强有力的理论至关重要地限制了对纯双离子和混合单离子和双离子系统中各向异性的温度依赖性的理解。在这里，我们使用格林函数理论和原子蒙特卡罗模拟，以确定在这些纯和混合的情况下，从饱和到消失的磁化铁磁体的有效各向异性的温度标度。在低温下，我们发现，纯双离子各向异性尺度与减少的磁化$k(m) \sim m^{2.28}$，而混合的情况下描述的多样性的温度依赖性的各向异性在实际材料中观察到的。这里确定的混合各向异性的温度依赖性预计将大大有助于理解和控制的磁性材料的热性能。
英文摘要：
Magnetic anisotropy plays an essential role in information technology applications of magnetic materials, providing a means to retain the long-term stability of a magnetic state in the presence of thermal fluctuations. Anisotropy consists of a single-ion contribution stemming from the crystal structure and two-ion terms attributed to the exchange interactions between magnetic atoms. A lack of robust theory crucially limits the understanding of the temperature dependence of the anisotropy in pure two-ion and mixed single-ion and two-ion systems. Here, we use Green's function theory and atomistic Monte Carlo simulations to determine the temperature scaling of the effective anisotropy in ferromagnets in these pure and mixed cases, from saturated to vanishing magnetization. At low temperature, we find that the pure two-ion anisotropy scales with the reduced magnetization as $k(m) \sim m^{2.28}$, while the mixed scenario describes the diversity of the temperature dependence of the anisotropy observed in real materials. The temperature dependence of the mixed anisotropy determined here is expected to considerably contribute to the understanding and the control of the thermal properties of magnetic materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
