Correlation of structure and magnetism of ultrathin Co films on Pd(001) prepared by thermal and pulsed laser deposition
Correlation of structure and magnetism of ultrathin Co films on Pd(001) prepared by thermal and pulsed laser deposition
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热脉冲激光沉积 Pd(001) 上超薄 Co 薄膜结构与磁性的相关性
DOI：
10.1103/physrevb.76.035425
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发表时间：
2007
影响因子：
3.7
通讯作者：
J. Kirschner
中科院分区：
文献类型：
--
作者：
H. Meyerheim;M. Przybylski;A. Ernst;Y. Shi;J. Henk;E. Soyka;J. Kirschner
我们对通过热沉积 (TD) 和脉冲激光沉积 (PLD) 生长的 Pd(001) 上 1 和 2 单层 (ML) 厚的 Co 薄膜的原子结构和磁性能进行了实验和理论相结合的分析。虽然表面 X 射线衍射测量表明，沉积样品的几何结构因沉积方法（PLD 的合金形成与 TD 的外延生长）而异，但磁光克尔效应环表明面内易磁化轴与制备方法无关。 600 K 退火导致易磁化轴从面内重新定向到面外。这与实质性的结构重组同时进行，形成具有顶部 Pd 层的 Co/Pd 多层结构。与实验一致，完全相对论 Kohn-Korringa-Rostoker 计算（包括实验得出的结构弛豫和无序）预测了生长样品的面内磁化强度和以（不完整）Pd/Co/Pd/Co/Pd(001) 层序列为特征的退火 2 ML 样品的面外磁化强度。然而，1 ML Pd/Co/Pd(001) 夹层的面内磁化强度是理论上预测的。我们的研究强调了结构有序、弛豫和界面对磁各向异性能量的贡献的决定性重要性。
We present a combined experimental and theoretical analysis of the atomic structure and the magnetic properties of 1- and 2-monolayer (ML)-thick Co films on Pd(001) grown by thermal deposition (TD) and pulsed laser deposition (PLD). While surface x-ray diffraction measurements show that the geometric structures of the as-deposited samples differ depending on the deposition method (alloy formation for PLD versus epitaxial growth for TD), magneto-optic Kerr-effect loops indicate an in-plane easy magnetization axis independent of the preparation method. Annealing at 600 K induces a reorientation of the easy magnetization axis from in-plane to out of plane. This goes in parallel with substantial structural reorganization, leading to a Co/Pd multilayer structure with a top Pd layer. In agreement with experiments, fully relativistic Kohn-Korringa-Rostoker calculations including experimentally derived structural relaxations and disorder predict in-plane magnetization for the as-grown samples and out-of-plane magnetization for the annealed 2 ML sample characterized by an (incomplete) Pd/Co/Pd/Co/Pd(001) layer sequence. However, in-plane magnetization for the 1 ML Pd/Co/Pd(001) sandwich is theoretically predicted. Our study emphasizes the decisive importance of structural order, relaxation, and interface contribution to the magnetic anisotropy energy.