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首页> 外文期刊>Physical review >Interface-driven manipulation of the magnetic anisotropy of ultrathin Co films on Pt(111): Substrate deposition of hydrogen and model calculations
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Interface-driven manipulation of the magnetic anisotropy of ultrathin Co films on Pt(111): Substrate deposition of hydrogen and model calculations

机译：Pt（111）上超薄Co膜的磁各向异性的界面驱动操纵：氢的基质沉积和模型计算

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The magnetic anisotropy energy (MAE) and the resulting spin-reorientation transitions of Co/Pt(111) ultra-thin films are investigated by manipulating the Co/Pt interface with controlled adsorption of hydrogen prior to Co deposition. In situ low-energy electron-diffraction and surface magneto-optical Kerr-effect measurements are performed on Co films grown at low temperatures. The results show that interface H deposition leads to a remarkable change in the magnetization direction from perpendicular to in-plane, even for the thinnest Co films, which is accompanied by an important increase in the coercive force. Layer-resolved self-consistent electronic calculations of the MAE are performed in order to identify the interface contributions responsible for perpendicular magnetic anisotropy (PMA) and to quantify how the MAE depends on various possible adsorbate-induced modifications in the local magnetic moments. The results show that the PMA is quite insensitive to changes in the local magnetic moments at the Co film surface even if they are relatively large. However, the PMA depends crucially on the Co-interface moments, on the Pt-interface moments induced by the proximity to Co, and on the resulting spin-orbit interactions at the Pt atoms. The observed suppression of PMA by interface H adsorption is interpreted as the consequence of the reduction in the interface-Pt moments which, originates either a reduction in the Co-interface moments or at a decoupling of the Pt substrate from the magnetic film. Experiment and theory thus prove the dominant role of the Co-Pt interface MAE on the development of the relative stability of perpendicular and in-plane magnetization directions. The magnetic properties of ultrathin films may thus be tailored to a large extent by adsorbates trapped at 3d-4d or 3d-5d film-substrate interfaces.
机译：通过在沉积Co之前控制氢的吸附来操纵Co / Pt界面，研究了Co / Pt（111）超薄膜的磁各向异性能（MAE）和所产生的自旋取向转变。在低温下生长的Co膜上进行原位低能电子衍射和表面磁光Kerr效应测量。结果表明，即使对于最薄的Co膜，界面H的沉积也会导致磁化方向从垂直方向到平面内发生显着变化，并伴随着矫顽力的显着增加。进行MAE的层解析自洽电子计算，以便识别引起垂直磁各向异性（PMA）的界面贡献，并量化MAE如何依赖于局部磁矩中各种可能的吸附物诱导的修饰。结果表明，PMA对Co膜表面局部磁矩的变化不敏感，即使它们相对较大。但是，PMA关键取决于Co界面矩，与Co的接近引起的Pt界面矩以及在Pt原子上产生的自旋轨道相互作用。观察到的界面H吸附对PMA的抑制作用是界面Pt矩减小的结果，这是由于Co界面矩减小或Pt基板与磁性膜解耦引起的。因此，实验和理论证明了Co-Pt界面MAE在垂直和平面磁化方向的相对稳定性发展中的主导作用。因此，可以通过截留在3d-4d或3d-5d薄膜-基底界面处的吸附物来在很大程度上调整超薄膜的磁性。

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