Structure and magnetic properties of iron nitride thin films on Cu(001)
Structure and magnetic properties of iron nitride thin films on Cu(001)
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Cu(001)上氮化铁薄膜的结构和磁性能
DOI：
10.1103/physrevb.81.035422
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Nakagawa and T. Yokoyama
中科院分区：
文献类型：
--
作者：
Y. Takagi;K. Isami;I. Yamamoto;T. Nakagawa and T. Yokoyama
利用低能电子衍射（LEED）、扫描隧道显微镜（STM）、X射线吸收光谱和X射线磁性圆二色性（XMCD）研究了在Cu（001）表面制备的氮化铁薄膜的结构和磁性。在1和2单层（ML）薄膜的STM和LEED观察中，氮化物薄膜的位错或岛没有显着量的重建光滑的表面。发现1 ML膜的化学计量比是，而2 ML膜的化学计量比是，由最顶层的组成和第二层仅含Fe原子组成。的XMCD测量进行氮化物膜高达4 ML。随角度变化的XMCD谱表明薄膜是铁磁性的，易磁化轴沿着表面平行方向。此外，根据求和规则分析的结果，在1 ML膜中出现强磁各向异性，其中垂直于表面的轨道磁矩几乎为零。的总磁矩，这是一个组合的自旋和轨道磁矩，随着膜厚度的增加而增加到3 ML。大于2ML的磁矩为，几乎等于bulkof的磁矩。
The structural and magnetic properties of iron nitride thin films on a Cu(001) surface were investigated by low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), x-ray absorption spectroscopy, and x-ray magnetic circular dichroism (XMCD). In the STM and LEED observations of 1 and 2 monolayer (ML) films, the nitride films exhibitreconstructed smooth surfaces without significant amounts of dislocations or islands. The stoichiometry of the 1 ML film was found to be, while that of 2 ML was, consisting of a topmost layer with thecomposition and a second layer containing Fe atoms only. The XMCD measurements were performed for nitride films up to 4 ML. The angle-dependent XMCD spectra indicate that the films are ferromagnetic, with easy axes along the surface parallel direction. In addition, according to the results of the sum-rule analysis, strong magnetic anisotropy appears in the 1 ML film, where the orbital magnetic moment perpendicular to the surface is almost zero. The total magnetic moment, which is a combination of the spin and orbital magnetic moments, increases with the increase in film thickness up to 3 ML. The magnetic moment for more than 2 ML is, which is nearly equal to that of bulkof.