Thermal transport and domain structure

热传输和域结构

• 批准号: 198132664
• 负责人: Professor Dr. Christian Hemker-Heß
• 金额: --
• 依托单位: Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW) e.V.
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198132664?language=en
• 关键词: Thermal; transport; domain; structure

In this project the interplay between the thermal transport and magnetic microstructure (domains and domain walls) in magnetic films is investigated. Spin currents are generated by applying temperature gradients across extended films and stripes in a magnetic field and they are de-tected by the Inverse Spin Hall Effect. At the same time the magnetic domain structure is in-situ manipulated and controlled by digitally enhanced Kerr microscopy. The influence of magnetic microstructure on thermo-spin effects (such as the spin Seebeck effect) is studied by systematic variation of the domain structure in external magnetic fields, by tuning magnetic anisotropies and by selecting specific materials (Permalloy, Heusler alloys and magnetic garnet films). In the same setup the influence of thermal spin current on domain walls is studied. Besides the thermo-spin effects, conventional, potentially “parasitic” (magneto)-caloric transport effects (Nernst effect, thermopower etc.) are systematically measured.

在这个项目中，我们研究了磁性薄膜中的热输运和磁性微结构(磁区和磁区壁)之间的相互作用。自旋电流是通过在磁场中跨扩展薄膜和条带施加温度梯度而产生的，并且它们是由逆自旋霍尔效应决定的。同时，利用数字增强型克尔显微镜对磁畴结构进行了原位操纵和控制。通过系统地改变外磁场中的磁畴结构，通过调节磁各向异性和选择特定的材料(坡莫合金、Heusler合金和磁性石榴石薄膜)，研究了磁微结构对热旋效应(如自旋Seebeck效应)的影响。在相同的实验装置下，研究了热自旋电流对磁畴壁的影响。除了热旋效应外，传统的、潜在的“寄生”(磁)热能传输效应(能斯特效应、热电势等)。都被系统地测量过。

项目成果

Thermoelectric effects and magnetic anisotropy of Ga 1-x Mn x As thin films

Ga 1-x Mn x As薄膜的热电效应和磁各向异性

• DOI: 10.1103/physrevb.90.104423
• 发表时间: 2014
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: I. V. Soldatov;N. Panarina;C. Hess;L. Schultz;R. Schäfer
• 通讯作者: R. Schäfer

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

• DOI: 10.1016/j.physrep.2019.02.004
• 发表时间: 2018-05
• 期刊: Physics Reports
• 作者: C. Hess