Towards pure spin currents in epitaxial all oxide heterostructures

外延全氧化物异质结构中的纯自旋电流

• 批准号: 406078190
• 负责人: Dr. Matthias Althammer
• 金额: --
• 依托单位: Walther-Meißner-Institut für Tieftemperaturforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/406078190?language=en
• 关键词: Towards; pure; spin; currents; epitaxial

Over the last years, the generation and detection of pure spin currents, i.e. the flow of angular momentum without any accompanying charge current, has been successfully realized. This opened fascinating opportunities for fundamental physics experiments and novel applications in spin electronics. However, a profound understanding of the phenomena associated with pure spin currents and the materials systems suitable for their study is still missing. The main objective of this research proposal is the systematic study of pure spin current physics in all oxide heterostructures, which are promising for this purpose but hardly investigated so far. On the one hand, the planned experiments are expected to provide a profound understanding of the rich variety of phenomena associated with spin-orbit interaction in oxide materials and its dependence on the specific material parameters. On the other hand, the project aims to develop and investigate novel materials with large spin Hall angle, i.e. with a large efficiency for electrical generation and detection of pure spin currents. Moreover, it aims at the tunability of spin-orbit coupling in oxides via strain, oxygen vacancies, and temperature. The boost of the efficiency for spin current generation and detection is a prerequisite for the application of pure spin currents in efficient spintronic devices. The ambitious project objectives will be met by fabricating high-quality oxide heterostructures by laser-molecular beam epitaxy and by systematically studying pure spin current generation and detection in experiments based on longitudinal spin Seebeck effect and spin Hall magnetoresistance. The applicants contribute broad expertise in both thin film technology and the experimental characterization techniques for spin current phenomena to the successful implementation of the ambitious research program.

在过去的几年里，纯自旋电流的产生和检测，即没有任何伴随的电荷电流的角动量流，已经成功地实现。这为基础物理实验和自旋电子学的新应用开辟了迷人的机会。然而，与纯自旋电流相关的现象和适合其研究的材料系统的深刻理解仍然缺失。这项研究计划的主要目标是系统地研究纯自旋电流物理在所有的氧化物异质结构，这是有前途的，但几乎没有调查到目前为止。一方面，计划中的实验预计将提供与氧化物材料中的自旋轨道相互作用及其对特定材料参数的依赖性相关的各种现象的深刻理解。另一方面，该项目旨在开发和研究具有大自旋霍尔角的新型材料，即具有高效率的发电和检测纯自旋电流。此外，它旨在通过应变，氧空位和温度在氧化物中的自旋轨道耦合的可调谐性。提高自旋电流的产生和检测效率是将纯自旋电流应用于高效自旋电子器件的先决条件。雄心勃勃的项目目标将通过激光分子束外延制造高质量的氧化物异质结构，并通过系统地研究纯自旋电流的产生和基于纵向自旋塞贝克效应和自旋霍尔磁阻的实验检测来实现。申请人在薄膜技术和自旋电流现象的实验表征技术方面提供了广泛的专业知识，以成功实施雄心勃勃的研究计划。