Magnetism of FePt Surface Alloys
Magnetism of FePt Surface Alloys
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DOI：
10.1103/physrevlett.102.067207
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发表时间：
2009-02-13
影响因子：
8.6
通讯作者：
Kern, K.
中科院分区：
文献类型：
--
作者：
Honolka, J.;Lee, T. Y.;Kern, K.
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表面合金的结构与磁性的复杂关系。根据铁的特定横向原子配位，可以观察到与大块FePt相当的硬磁性或由于Dzyaloshinski-Moriya相互作用而产生的复杂非共线磁性。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，并表明L1(0)体磁体中Fe和Pt层的三维堆叠并不是实现高各向异性值所必需的。
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.