论文标题
抗铁磁体中自旋模型参数的温度依赖性
Temperature dependence of spin-model parameters in antiferromagnets
论文作者
论文摘要
介质自旋模型参数的温度依赖性基于Green的功能理论，以两种共同的反铁磁对齐系统得出。发现横向自旋相关性降低了各向异性项，同时增加了海森伯格和dzyaloshinsky--Moriya交换相互作用以及后者对各向异性的贡献。获得的温度依赖性显示了与铁磁体结果的定量一致，它们也与数值原子模拟很好地一致，这些模拟将自旋相关性处理而无需近似。讨论了结果在多尺度建模中的可能应用。
The temperature dependence of mesoscopic spin-model parameters is derived in two-sublattice antiferromagnetically aligned systems based on Green's function theory. It is found that transversal spin correlations decrease the anisotropy terms while increasing the Heisenberg and Dzyaloshinsky--Moriya exchange interactions and the latter's contribution to the anisotropy. The obtained temperature dependences show quantitative agreement with the results for ferromagnets, and they also agree well with numerical atomistic simulations which treat the spin correlations without approximations. Possible applications of the results in multiscale modelling are discussed.
