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Ni and CoO spin cantings induced by Fe layer in Ni/CoO/Fe/vicinal MgO(001)

机译:Ni / CoO / Fe /邻位MgO中Fe层引起的Ni和CoO自旋倾斜(001)

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摘要

Using element-resolved x-ray magnetic circular dichroism and x-ray magnetic linear dichroism measurements, we studied Ni/CoO/vicinal MgO(001),and Ni/CoO/Fe/vicinal MgO(001) systems at 350 and 78 K. Above the CoO Neel temperature, the Ni magnetization is fully in plane and parallel to the atomic steps in both systems due to step-induced magnetic anisotropy. Below the CoO Neel temperature, the CoO spins in Ni/CoO/vicinal MgO(001) are fully in plane and parallel to the atomic steps and the Ni magnetization is fully in plane and perpendicular to the atomic steps due to the 90° Ni/CoO magnetic coupling. The CoO spins in Ni/CoO/Fe/vicinal MgO(001), however, develop an out-of-plane canted spin component in addition to the in-plane component parallel to the atomic steps. Consequendy, the Ni magnetization is canted towards the out-of-plane direction by an appreciable angle. Photoemission electron microscopy imaging shows a 90° interfacial magnetic coupling at both the Ni/CoO and the CoO/Fe interfaces and an absence of a direct interlayer coupling, showing that the Ni spin canting is due to its coupling to the canted CoO spin components which is caused by the underlying ferromagnetic Fe layer in Ni/CoO/Fe/vicinal MgO(001).
机译:使用元素分解的X射线磁性圆二色性和X射线磁性线性二色性的测量,我们研究了在350和78 K下Ni / CoO /邻位MgO(001)和Ni / CoO / Fe /邻位MgO(001)系统。在高于CoO Neel温度的情况下,由于步进感应的磁各向异性,Ni的磁化完全在平面内并且平行于两个系统中的原子台阶。低于CoO Neel温度时,由于90°Ni /,Ni / CoO /邻近MgO(001)中的CoO自旋完全在平面内且平行于原子阶跃,并且Ni磁化完全在平面内且垂直于原子阶跃。 CoO磁耦合。 Ni / CoO / Fe /邻位MgO(001)中的CoO自旋,除了与原子步平行的面内成分外,还形成了面外倾斜的自旋成分。结果,Ni磁化以可观的角度朝平面外方向倾斜。光发射电子显微镜成像显示在Ni / CoO和CoO / Fe界面处均存在90°界面磁耦合,并且不存在直接的层间耦合,这表明Ni自旋倾斜是由于其与倾斜的CoO自旋成分的耦合所致。这是由Ni / CoO / Fe /邻位MgO(001)中下面的铁磁性Fe层引起的。

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  • 来源
    《Physical review》 |2017年第21期|214405.1-214405.10|共10页
  • 作者单位

    Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA;

    Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Korea;

    International Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China;

    Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA;

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