Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
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DOI：
10.1103/physrevb.98.214439
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发表时间：
2018-12-26
影响因子：
3.7
通讯作者：
Hillebrands, B.
中科院分区：
文献类型：
--
作者：
Conca, A.;Keller, S.;Hillebrands, B.
我们提出了依赖于角度的测量与MgO，Al和Pt帽层的外延Fe层的阻尼特性。基于晶格缺陷遵循晶体对称性的择优分布，我们利用缺陷密度模型将双磁振子散射对阻尼的贡献与自旋泵效应、粘性吉尔伯特阻尼和磁邻近效应对阻尼的各向同性贡献分开。分离的两个磁振子的贡献，这在很大程度上取决于缺陷密度，允许测量的有效自旋混合电导的值，这是更接近的值完全由于自旋泵。因此，消除了由于不同的覆盖层和样品之间不可避免的缺陷密度扩散而对双层系统的缺陷密度的影响。这表明，在完全有序的系统中，这种分离是可能的，相反的多晶或非晶金属薄膜的自旋泵现象的研究潜力。
We present angle-dependent measurements of the damping properties of epitaxial Fe layers with MgO, Al, and Pt capping layers. Based on the preferential distribution of lattice defects following the crystal symmetry, we make use of a model of the defect density to separate the contribution of two-magnon scattering to the damping from the isotropic contribution originating in the spin pumping effect, viscous Gilbert damping, and the magnetic proximity effect. The separation of the two-magnon contribution, which depends strongly on the defect density, allows for the measurement of a value of the effective spin mixing conductance that is closer to the value exclusively due to spin pumping. The influence of the defect density for bilayer systems due to the different capping layers and to the unavoidable spread in defect density from sample to sample is thus removed. This shows the potential of studying spin pumping phenomena in fully ordered systems in which this separation is possible, contrary to polycrystalline or amorphous metallic thin films.