Energy and angular momentum exchange between electron and spin-system in ferromagnetic films

铁磁薄膜中电子和自旋系统之间的能量和角动量交换

• 批准号: 5388532
• 负责人: Professor Dr. Martin Aeschlimann
• 金额: --
• 依托单位: Institut für Experimentelle und Angewandte Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5388532?language=en
• 关键词: Energy; angular; momentum; exchange; between

The subject of this project is to study the dynamics of the relevant energy and angular momentum transfer between excited electrons and the spin system of a ferromagnetic solid. These dissipation processes are important for many fundamental mechanisms in the field of ultrafast spin dynamics. Using different laser pulse intensities we will be able to distinguish two different regimes: 1) the direct interaction of a single excited electron and the spin-system. Special emphasis will be given to the strength of spin-waves loss modes, local vs. nonlocal spin-orbit coupling, and the strength of interface momentum take-up. 2) the case of a strong thermal non-equilibrium between a highly excited electron system and a cold spin system. The aim is to gain detailed insight into the response of the magnetization after an ultrafast heating laserpulse. The studies will be performed by femtosecond pump-probe methods: magneto-optic Kerr effect and linear and nonlinear photoemission. The investigations will focus on thin films and multilayers of the itinerant ferromagnets Co, Ni, Fe and of the ferromagnet Gd with a localized spin moment.

本计画的主题是研究铁磁固体中受激电子与自旋系统之间的相关能量与角动量转移的动力学。这些耗散过程对于超快自旋动力学领域中的许多基本机制都很重要。使用不同的激光脉冲强度，我们将能够区分两种不同的区域：1）单个激发电子与自旋系统的直接相互作用。特别强调的是自旋波损失模式的强度，本地与非本地自旋轨道耦合，以及接口动量吸收的强度。2)高激发电子系统和冷自旋系统之间的强热非平衡的情况。目的是获得详细的洞察超快加热激光脉冲后的磁化响应。研究将采用飞秒泵浦-探测方法：磁光克尔效应和线性与非线性光电效应。调查将集中在薄膜和多层的巡回铁磁体Co，Ni，Fe和具有本地化自旋矩的铁磁体Gd。