Pt/Co/Pt /Co/Ta/BTO异质结自旋轨道矩与磁化方位角关系的定量表征
Quantitative characterization of spin-orbit torques in Pt/Co/Pt /Co/Ta/BTO heterostructure on the magnetization azimuthal angle dependence
摘要：
深入理解重金属/铁磁体异质结构中的自旋-轨道相互作用对于利用自旋霍尔和Rashba效应开发自旋-轨道矩自旋电子学器件至关重要。虽然SOT有效场对面外磁化角依赖性的研究已经比较广泛，但对面内磁化角依赖性的理解仍然未知。在这里，我们解析地提出了一种方法来计算SOT的有效字段作为在垂直磁各向异性（PMA）结构中使用谐波霍尔技术的面内磁化角的函数。利用推导的公式研究了两种不同的PMA样品，Pt/Co/Pt/Co/Ta/BaTiO_3（BTO）测试样品和Pt/Co/Pt/Co/Ta参考样品。我们的测量结果表明，只有测试样品与BTO帽层的阻尼场表现出面内磁化角的依赖性，而没有角度的依赖性被发现在参考样品。BTO层的存在下，在测试样品中，这引起了在界面处的Rashba效应，归因于作为阻尼场的角度依赖性的源。
英文摘要：
Substantial understanding of spin-orbit interactions in heavy-metal (HM)/ferromagnet (FM) heterostructures is crucial in developing spin-orbit torque (SOT) spintronics devices utilizing spin Hall and Rashba effects. Though the study of SOT effective fields dependence on the out-of-plane magnetization angle has been relatively extensive, the understanding of in-plane magnetization angle dependence remains unknown. Here, we analytically propose a method to compute the SOT effective fields as a function of the in-plane magnetization angle using harmonic Hall technique in perpendicular magnetic anisotropy (PMA) structures. Two different samples with PMA, Pt/Co/Pt/Co/Ta/BaTiO3 (BTO) test sample and Pt/Co/Pt/Co/Ta reference sample are studied using the derived formula. Our measurements reveal that only the dampinglike field of the test sample with BTO capping layer exhibits an in-plane magnetization angle dependence while no angular dependence is found in the reference sample. The presence of the BTO layer in the test sample, which gives rise to a Rashba effect at the interface, is ascribed as the source of the angular dependence of the the dampinglike field.
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