Magnetization Dynamics and magnetic microscopy on the picosecond timescale

皮秒时间尺度的磁化动力学和磁显微镜

• 批准号: 5372890
• 负责人: Professor Dr. Georg Woltersdorf
• 金额: --
• 依托单位: Fachgruppe Optik
• 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 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5372890?language=en
• 关键词: Magnetization; Dynamics; magnetic; microscopy; picosecond

We will study the response of the magnetization of micron sized magnetic elements and extended films when they are excited by fast rise time magnetic field pulses. Investigations will utilize a time resolved scanning Kerr microscope with temporal resolution of about 1 ps and spatial resolution of 0.3 - 1 micron. The fast rise time field pulses will trigger the precessional motion of the magnetization which will be recorded locally. In this way, we gain information on non-uniform magnetization excitations on the picosecond time-scale. The experiments can be performed in air and in ultra high vacuum which allows us to investigate clean epitaxially grown single crystalline magnetic layers. In addition, micron sized magnetic elements can be grown in-situ. Special emphasis will be given to the evolution of the damping parameter in these clean samples. In addition, exchange coupled ferromagnetic layers will be studied when excited by a fast magnetic field pulse.

我们将研究微米级磁性元件和延伸薄膜在被快速上升时间磁场脉冲激发时磁化的响应。研究将利用时间分辨率扫描克尔显微镜，时间分辨率约为 1 皮秒，空间分辨率为 0.3 - 1 微米。快速上升时间场脉冲将触发磁化强度的进动运动，该运动将被本地记录。通过这种方式，我们获得了皮秒时间尺度上非均匀磁化激励的信息。这些实验可以在空气和超高真空中进行，这使我们能够研究干净的外延生长的单晶磁性层。此外，微米尺寸的磁性元件可以原位生长。将特别强调这些干净样品中阻尼参数的演变。此外，还将研究由快速磁场脉冲激励时的交换耦合铁磁层。