论文标题
pt/y $ _ {3} $ fe $ _ {5} $ o $ $ $ _ {12} $和倒置y $ _ {3} $ _ {3} $ _ {5} $ _ {5} $ _ {12} $ _ {12} $ _ {12} $/pt bilayers
Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y$_{3}$Fe$_{5}$O$_{12}$ and inverted Y$_{3}$Fe$_{5}$O$_{12}$/Pt bilayers
论文作者
论文摘要
重金属PT薄膜的磁性状态与铁磁性绝缘子y $ _ {3} $ fe $ _ {5} $ o $ $ _ {12} $通过X射线磁性磁性二色二色二色二色二色反射率和X射线谐振磁反射率与角度依赖的玛格诺代表研究进行了系统地研究。为了揭示与PT中诱导磁矩的可能原因相互混合的效果，我们比较了薄膜异质结构的层堆叠和不同的界面特性。对于y $ _ {3} $ fe $ _ {5} $ o $ _ {12} $薄膜的标准pt层，我们没有检测到pt中的任何静态磁极化。这些样品表现出依赖角度的磁倍率行为，这与已建立的自旋霍尔磁场抗性一致。相比之下，对于倒层序列，y $ _ {3} $ fe $ _ {5} $ o $ $ $ _ {12} $薄膜在PT层上生长，PT显示了有限的诱导磁矩，可与全金属PT/Fe Bilayers相当。发现这一磁矩源于y $ _ {3} $ fe $ _ {5} $ o $ $ $ _ {12} $/pt接口的有限混合。结果，我们发现了一个复杂的角度依赖性磁倍率，表明在这些类型的样品中旋转大厅的叠加和各向异性磁倍率。由于其不同的角度依赖性及其特征温度的演变，这两种效应都可以彼此分离。
The magnetic state of heavy metal Pt thin films in proximity to the ferrimagnetic insulator Y$_{3}$Fe$_{5}$O$_{12}$ has been investigated systematically by means of x-ray magnetic circular dichroism and x-ray resonant magnetic reflectivity measurements combined with angle-dependent magnetotransport studies. To reveal intermixing effects as the possible cause for induced magnetic moments in Pt, we compare thin film heterostructures with different order of the layer stacking and different interface properties. For standard Pt layers on Y$_{3}$Fe$_{5}$O$_{12}$ thin films, we do not detect any static magnetic polarization in Pt. These samples show an angle-dependent magnetoresistance behavior, which is consistent with the established spin Hall magnetoresistance. In contrast, for the inverted layer sequence, Y$_{3}$Fe$_{5}$O$_{12}$ thin films grown on Pt layers, Pt displays a finite induced magnetic moment comparable to that of all-metallic Pt/Fe bilayers. This magnetic moment is found to originate from finite intermixing at the Y$_{3}$Fe$_{5}$O$_{12}$/Pt interface. As a consequence, we found a complex angle-dependent magnetoresistance indicating a superposition of the spin Hall and the anisotropic magnetoresistance in these type of samples. Both effects can be disentangled from each other due to their different angle dependence and their characteristic temperature evolution.
