Electronic structure and magnetism of one-dimensional Fe monatomic wires on Au(788) investigated with ARPES and XMCD
Electronic structure and magnetism of one-dimensional Fe monatomic wires on Au(788) investigated with ARPES and XMCD
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DOI：
10.1103/physrevb.75.245423
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发表时间：
2007-06-01
影响因子：
3.7
通讯作者：
Kawai, Maki
中科院分区：
文献类型：
--
作者：
Fujisawa, Hideki;Shiraki, Susumu;Kawai, Maki
在本研究中，在Au（788）衬底上制备的一维（1D）单原子Fe线，电子和磁性特征的角度分辨光电子能谱（ARPES）和X射线磁性圆二色性（XMCD）进行了研究。的ARPES光谱显示几乎没有分散在平行和垂直方向的线揭示了强烈的本地化性质的Fe 3d电子。有限强度的XMCD信号具有角度依赖性，反映了易磁化轴垂直于衬底的局部磁矩的各向异性特征。的XMCD信号的温度和场的依赖性显示超顺磁性行为以及描述的1D伊辛模型表现出大的滞后低于阻断温度，这是由各向异性能。随着温度的降低，自旋块的平均尺寸的增加增强了一维自旋系统的磁性在窄的温度范围内从软到硬的急剧变化。
In this study of fabricated one-dimensional (1D) monatomic Fe wires on a Au(788) substrate, electronic and magnetic features are investigated by angle-resolved photoemission spectroscopy (ARPES) and x-ray magnetic circular dichroism (XMCD). The ARPES spectra show little dispersion both in the parallel and perpendicular directions to the wires revealing a strongly localized nature of the Fe 3d electrons. Finite intensity of the XMCD signals has angular dependence reflecting an anisotropic feature of the localized magnetic moments with an easy axis perpendicular to the substrate. Temperature and field dependence of the XMCD signals shows superparamagnetic behavior well described by the 1D Ising model exhibiting large hysteresis below the blocking temperature, which is ruled by the anisotropy energy. Increase of the average size of the spin blocks with reduced temperature enhances the dramatic change of the magnetic properties of the 1D spin system from soft to hard within a narrow temperature range.