FePt的温度相关磁性：有效自旋哈密顿模型
Temperature dependent magnetic properties of FePt: effective spin Hamiltonian model
摘要：
基于非共线磁位形的第一性原理计算，提出了一个有序铁磁FePt中磁相互作用的模型，该模型能够解释最近的磁各向异性能（MAE）测量结果.的网站（Fe，Pt）解决的MAE的贡献已被区分与小Fe易平面和大Pt易轴条款。该模型已被测试对现有的实验数据的MAE的温度依赖性显示单轴MAE（K $_{1}$（T））与磁化（M（T））$K_{1}(T) \sim M(T)^γ$的特点是不寻常的指数$γ= 2.1$的标度。结果表明，这种不寻常的行为的FePt可以定量解释内所提出的模型和起源于一个有效的各向异性交换介导的诱导Pt时刻。预期后者是具有大自旋轨道耦合和交换增强的Stoner磁化率的5d/4d元素的3d-5d（4d）合金的共同特征。
英文摘要：
A model of magnetic interactions in the ordered ferromagnetic FePt is proposed on the basis of first-principles calculations of non-collinear magnetic configurations and shown to be capable of explaining recent measurements of magnetic anisotropy energy (MAE). The site (Fe,Pt) resolved contributions to the MAE have been distinguished with small Fe easy-plane and large Pt easy-axis terms. This model has been tested against available experimental data on the temperature dependence of MAE showing scaling of uniaxial MAE (K$_{1}$(T)) with magnetization (M(T)) $K_{1}(T) \sim M(T)^γ$ characterized by the unusual exponent of $γ= 2.1$. It is shown that this unusual behavior of the FePt can be quantitatively explained within the proposed model and originates from an effective anisotropic exchange mediated by the induced Pt moment. The latter is expected to be a common feature of 3d-5d(4d) alloys having 5d/4d elements with large spin-orbit coupling and exchange enhanced Stoner susceptibility.
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