Tsujikawa Masahito, Oda Tatsuki
Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan.
Phys Rev Lett. 2009 Jun 19;102(24):247203. doi: 10.1103/PhysRevLett.102.247203. Epub 2009 Jun 18.
We investigate crystalline magnetic anisotropy in the electric field (EF) for the FePt surface which has a large perpendicular anisotropy, by means of the first-principles approach. Anisotropy is reduced linearly with respect to the inward EF, associated with the induced spin density around the Fe layer. Although the magnetic anisotropy energy (MAE) density reveals large variation around the atoms, the intrinsic contribution to the MAE is found to mainly come from the Fe layer. The surface without the capping Pt layer also shows similar linear dependence.
我们通过第一性原理方法研究了具有大垂直各向异性的FePt表面在电场（EF）中的晶体磁各向异性。各向异性相对于向内的电场呈线性降低，这与Fe层周围诱导的自旋密度有关。尽管磁各向异性能量（MAE）密度在原子周围显示出很大变化，但发现对MAE的本征贡献主要来自Fe层。没有覆盖Pt层的表面也显示出类似的线性依赖性。
