Theory of giant thermal magnetogalvanic effects in magnetic tunnel junctions

磁隧道结巨热磁电效应理论

• 批准号: 197678537
• 负责人: Professor Dr. Christian Heiliger
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 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/197678537?language=en
• 关键词: Theory; giant; thermal; magnetogalvanic; effects

Magnetic tunnel junctions with MgO as a barrier are promising candidates for spin-caloric applications. The MgO barrier acts as a symmetry filter which leads to a high spin polarized current when CoFe magnetic layers are used. Such junctions show a huge difference in the transport properties of both spin channels. Consequently, one can expect also huge spin-caloric effects like magnetothermoelectric power. A drawback of CoFe alloys is the short spin diffusion length which makes this system less suitable for the spin-Seebeck effect. This insufficiency can be overcome by using halfmetallic leads. In particular, we will focus on the Co2FeAl Heusler compound. In this project we perform ab intio calculations of the spin-Seebeck (or spin-dependent Seebeck) effect and the magento-thermoelectric power. Further we will develop a method to account for electron-magnon coupling to calculate transport properties and the spin-transfer torque as a function of temperature.

以MGO为障碍的磁性隧道连接是旋转式应用的有希望的候选人。 MGO屏障充当对称滤波器，当使用COFE磁性层时导致高自旋极化电流。这种连接在两个自旋通道的传输特性上都显示出很大的差异。因此，人们也可以期望巨大的自旋效应，例如磁透光电源。 COFE合金的缺点是短自旋扩散长度，它使该系统不适合自旋式效果。可以使用半金属铅来克服这种功能不全。特别是，我们将重点放在二氧化碳啤酒级化合物上。在这个项目中，我们对自旋表效果（或旋转依赖性的Seebeck）效应和洋红性 - 心理电源执行AB Intio计算。此外，我们将开发一种方法来说明电子磁通耦合以计算传输特性和自旋转移扭矩作为温度的函数。