Honolka J, Lee T Y, Kuhnke K, Enders A, Skomski R, Bornemann S, Mankovsky S, Minár J, Staunton J, Ebert H, Hessler M, Fauth K, Schütz G, Buchsbaum A, Schmid M, Varga P, Kern K
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
Phys Rev Lett. 2009 Feb 13;102(6):067207. doi: 10.1103/PhysRevLett.102.067207.
The complex correlation of structure and magnetism in highly coercive monoatomic FePt surface alloys is studied using scanning tunneling microscopy, x-ray magnetic circular dichroism, and ab initio theory. Depending on the specific lateral atomic coordination of Fe either hard magnetic properties comparable to that of bulk FePt or complex noncollinear magnetism due to Dzyaloshinski-Moriya interactions are observed. Our calculations confirm the subtle dependence of the magnetic anisotropy and spin alignment on the local coordination and suggest that 3D stacking of Fe and Pt layers in bulk L1_{0} magnets is not essential to achieve high-anisotropy values.
利用扫描隧道显微镜、X射线磁圆二色性和从头算理论研究了高矫顽力单原子FePt表面合金中结构与磁性的复杂相关性。根据Fe的特定横向原子配位情况，要么观察到与块状FePt相当的硬磁性能，要么观察到由于Dzyaloshinski-Moriya相互作用导致的复杂非共线磁性。我们的计算证实了磁各向异性和自旋排列对局部配位的微妙依赖性，并表明在块状L1₀磁体中Fe和Pt层的三维堆叠对于实现高各向异性值并非必不可少。
