标题： 埋藏界面和[Co/Pt]10 /Fe多层膜中自旋取向的正交磁各向异性：Fe厚度的影响 显示英文标题

标题： Buried Interfaces and Spin Orientation in [Co/Pt]10 /Fe multilayer with Orthogonal Magnetic Anisotropy: Effect of Fe Thickness

摘要： 在本工作中，研究了[Co/Pt]ML/Fe多层膜中自旋取向以及耦合强度随Fe层厚度的变化情况。 [Co/Pt]ML/Fe多层膜具有与Fe层正交的各向异性，而[Co/Pt]ML分别具有平面内磁各向异性和垂直磁各向异性。 测量是使用原位磁光克尔效应（MOKE）和同位素敏感的深度分辨核共振散射（NRS）技术进行的。 在Fe生长过程中进行的实时原位MOKE测量显示，随着Fe层厚度的增加，Fe层的磁矩从垂直方向重新取向到平面内方向。 这是由于[Co/Pt]ML与Fe层之间的耦合减弱所致。 对于深度依赖性研究，使用NRS技术研究了两种具有相同厚度但Fe57标记层位置不同的[Co/Pt]ML/Fe多层膜（[Co/Pt]MLFe/Fe57）和[Co/Pt]MLFe57/Fe）。 还研究了在外加磁场变化下的薄膜以研究耦合强度。 测量是在X射线驻波条件下进行的，以增强共振产率。 观察到，在[Co/Pt]ML/Fe多层膜中的75{\AA }Fe，耦合沿Fe层的深度发生变化。 在[Co/Pt]ML和Fe界面处耦合较强，Fe层的自旋沿垂直方向排列，而在界面附近的磁矩则弱耦合，并沿磁易轴方向平面排列。 由于沿深度的耦合强度梯度，需要较大的磁场才能沿Fe层的磁硬轴重新取向界面处的自旋；然而，远离界面的自旋即使在低磁场下也能自由旋转。 显示英文摘要

摘要： In the present work, spin orientation and variation of the strength of coupling in [Co/Pt]ML/Fe multilayer have been investigated as a function of the thickness of the Fe layer. [Co/Pt]ML/Fe multilayer has orthogonal anisotropy with the Fe layer, and [Co/Pt]ML has in-plane magnetic anisotropy and perpendicular anisotropy, respectively. Measurements are performed using in-situ magneto-optical Kerr effect (MOKE) and isotope-sensitive depth-resolved nuclear resonance scattering (NRS) technique. Real-time in-situ MOKE measurement during Fe growth reveals that with an increase in thickness of the Fe layer, moments of Fe layer reorientation from out of the plane to in-plane direction. This is attributed to the decrease in the coupling between the [Co/Pt]ML and Fe layer. For the depth-dependent study, two [Co/Pt]ML/Fe multilayers having the same thickness but different positions of the Fe57 marker layer ([Co/Pt]MLFe/Fe57) and [Co/Pt]MLFe57/Fe ) were studied using the NRS technique. Films with varying external magnetic fields were also studied to investigate coupling strength. Measurements were performed under the x-ray standing wave conditions to enhance resonance yield. It is observed that for the 75 {\AA} Fe in [Co/Pt]ML/Fe multilayer, the coupling varies along the depth of the Fe layer. The coupling is strong at [Co/Pt]ML and Fe interface with spins of the Fe layer aligned in the out-of-plane direction, whereas moments away from the interface are weakly coupled and aligned in-plane along the magnetic easy axis. Due to this gradient in strength of coupling along the depth, a large magnetic field is required to reorient spins at the interface along the magnetic hard axis of the Fe layer; however, spins away from the interface can rotate freely even in the low magnetic field.