Abstract

Interlayer exchange coupling in thin films is one of the cornerstones of modern spintronics-based technology. This phenomena has been an active area of research for several decades. Such a large area of research is impossible to cover in a single review, therefore the focus of this paper is a few coupling mechanisms relevant in ultra-thin film structures. The first part of the paper covers static interlayer exchange coupling, providing a brief overview of various coupling mechanism including a new mechanism of non-collinear coupling which is attractive to spintronics applications. The next part discusses proximity polarization coupling which can appear as a dominating coupling mechanisms in Stoner enhanced materials. The final part of the paper reviews spin pumping as a form of dynamic coupling. A description of spin pumping is presented as an extension of static, RKKY coupling into dynamic coupling by allowing for a time-delayed response. This approach makes a natural connection between static and dynamic coupling. We also present a detailed derivation of the conventional derivation of spin pumping in a reparameterized form. This model is only applicable for highly conductive materials but fails for materials with large spin-orbit coupling. In view of this we review several spin pumping studies in Au, Ag, Pd, and Pt which explore the adequacy of this model and its limits.

中文翻译：

---

金属磁性单层和双层结构中的层间交换耦合，自旋泵和自旋输运

摘要

薄膜中的层间交换耦合是现代基于自旋电子学的技术的基石之一。这种现象几十年来一直是研究的活跃领域。如此之大的研究不可能在一次综述中涵盖，因此本文的重点是与超薄膜结构相关的几种耦合机制。本文的第一部分介绍了静态的层间交换耦合，简要概述了各种耦合机制，包括一种新的非共线耦合机制，该机制对自旋电子学应用具有吸引力。下一部分讨论了接近极化耦合，它可以作为斯托纳增强材料中的主要耦合机制。本文的最后部分将自旋泵作为动态耦合的一种形式进行了回顾。通过允许延时响应，将自旋泵浦的描述表示为将静态RKKY耦合扩展为动态耦合。这种方法在静态和动态耦合之间建立了自然的联系。我们还以重新参数化形式介绍了自旋泵的常规推导的详细推导。该模型仅适用于高导电材料，而不适用于具有大自旋轨道耦合的材料。有鉴于此，我们回顾了金，银，钯和铂中的几种自旋泵浦研究，探讨了该模型的适用性及其局限性。我们还以重新参数化形式介绍了自旋泵的常规推导的详细推导。该模型仅适用于高导电材料，而不适用于具有大自旋轨道耦合的材料。有鉴于此，我们回顾了金，银，钯和铂中的几种自旋泵浦研究，探讨了该模型的适用性及其局限性。我们还以重新参数化形式介绍了自旋泵的常规推导的详细推导。该模型仅适用于高导电材料，而不适用于具有大自旋轨道耦合的材料。有鉴于此，我们回顾了金，银，钯和铂中的几种自旋泵浦研究，探讨了该模型的适用性及其局限性。