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首页> 外文期刊>Physical review >Magnetic relaxation due to spin pumping in thick ferromagnetic films in contact with normal metals
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Magnetic relaxation due to spin pumping in thick ferromagnetic films in contact with normal metals

机译：与常规金属接触的厚铁磁薄膜中的自旋泵激引起的磁弛豫

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摘要

Spin pumping is the most important magnetic relaxation channel in ultrathin ferromagnetic layers in contact with normal metals (NMs). Recent experiments indicate that in thick films of insulating yttrium iron garnet (YIG) there is a large broadening of the ferromagnetic resonance (FMR) lines with deposition of a thin Pt layer which cannot be explained by the known damping processes. Here we present a detailed study of the magnetic relaxation due to spin pumping in bilayers made of a ferromagnetic material (FM) and a NM. Two alternative approaches are used to calculate the transverse and longitudinal relaxation rates used in the Bloch-Bloembergen formulation of damping. In one we consider that the dynamic exchange coupling at the interface transfers magnetic relaxation from the heavily damped conduction electron spins in the NM layer to the magnetization of the FM layer while the other utilizes spin currents and the concept of the spin-mixing conductance at the interface. While in thin FM films, the relaxation rates vary with the inverse of the FM layer thickness; in thick films, they become independent of the thickness because in the FM/NM structure the FMR excitation has a surface mode character. Regardless of the thickness range the longitudinal relaxation rate is twice the transverse rate resulting in damping of the magnetization with constant amplitude characterizing a Gilbert process. The enhanced spin-pumping damping explains the experimental observations in YIG/Pt bilayers.
机译：在与普通金属（NMs）接触的超薄铁磁层中，自旋泵浦是最重要的磁弛豫通道。最近的实验表明，在绝缘钇铁石榴石（YIG）的厚膜中，随着薄Pt层的沉积，铁磁共振（FMR）线有很大的展宽，这无法用已知的阻尼过程来解释。在这里，我们对由铁磁材料（FM）和NM制成的双层中的自旋泵引起的磁弛豫进行了详细研究。可以使用两种替代方法来计算在Bloch-Bloembergen阻尼公式中使用的横向和纵向松弛率。一方面，我们认为界面处的动态交换耦合将磁弛豫从NM层中的高阻尼传导电子自旋转移到FM层的磁化，而另一方则利用了自旋电流和自旋混合电导的概念。接口。在FM薄膜中，弛豫率随FM层厚度的倒数而变化；在厚膜中，它们变得与厚度无关，因为在FM / NM结构中，FMR激发具有表面模式特征。不论厚度范围如何，纵向弛豫速率都是横向速率的两倍，从而导致以吉尔伯特过程为特征的恒定振幅的磁化阻尼。增强的自抽泵阻尼解释了在YIG / Pt双层中的实验观察结果。

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