通过降低晶格对称性和改变Fe1-xCox合金薄膜的成分实现强烈增强的轨道磁矩。
Strongly enhanced orbital moment by reduced lattice symmetry and varying composition of Fe1-xCox alloy films.
作者信息
Yildiz F, Luo F, Tieg C, Abrudan R M, Fu X L, Winkelmann A, Przybylski M, Kirschner J
机构信息
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, (Saale), Germany.
出版信息
Phys Rev Lett. 2008 Jan 25;100(3):037205. doi: 10.1103/PhysRevLett.100.037205.
We studied tetragonally distorted Fe(1-x)Co(x) alloy films on Rh(001), which show a strong perpendicular anisotropy in a wide thickness and composition range. Analyzing x-ray magnetic circular dichroism spectra at the L_(3,2) edges we found a dependence of the Co magnetic orbital moment on the chemical composition of the Fe(1-x)Co(x) alloy films, with a maximum at x=0.6. For this composition, we observed an out-of-plane easy axis of magnetization at room temperature for film thickness up to 15 monolayers. Since both the magnetic orbital moment and the anisotropy energy show similar composition dependence, it confirms that both quantities are directly related. Our experiments show that the adjustment of the Fermi level by a proper choice of the alloy composition is decisive for the large magnetic orbital moment and for a large magnetic anisotropy in a tetragonally distorted lattice.
我们研究了在Rh(001)上的四方畸变Fe(1-x)Co(x)合金薄膜，这些薄膜在很宽的厚度和成分范围内表现出很强的垂直各向异性。通过分析L_(3,2)边缘的x射线磁圆二色光谱，我们发现Co磁轨道矩与Fe(1-x)Co(x)合金薄膜的化学成分有关，在x = 0.6时达到最大值。对于该成分，我们观察到室温下薄膜厚度达15个单层时存在垂直于平面的易磁化轴。由于磁轨道矩和各向异性能量都表现出相似的成分依赖性，这证实了这两个量是直接相关的。我们的实验表明，通过适当选择合金成分来调整费米能级，对于四方畸变晶格中的大磁轨道矩和大磁各向异性起着决定性作用。
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