SPP 1133: Ultrafast magnetization processes

优先计划的目的是实现对磁性有序薄膜，多层和微结构系统中快速磁化过程的时间演变的基本理解。挑战在于将超快磁化过程推进到几飞秒到纳秒的范围，这是一个尚未得到充分探索的主题。总体目标是了解在超快磁电子器件中应用所需的基本机制。要解决的基本主题是在短时间尺度上应用脉冲磁场，激光脉冲或注入自旋极化电子脉冲时小结构磁化的响应，范围从系统的小扰动到磁化方向的逆转。优先计划汇集了在飞秒时间尺度上的超快过程的专业知识，在皮秒时间尺度上的集体激发的经验，以及在纳秒时间尺度上的相干再磁化和宏观领域效应的经验。理论和实验工作将在密切合作下进行。这些实验的潜力是从最近可用的新方法和技术发展而来的。利用微型化线圈和波导产生的超短磁场脉冲，对飞秒激光系统进行了泵浦探测实验。利用短激光脉冲增加时间分辨率的高分辨率显微镜新技术的发展，以及新型探测器的发展受到强烈鼓励。

The aim of the priority programme is the achievement of a basic understanding of the temporal evolution of fast magnetisation processes in magnetically ordered films, multilayers and microstructured systems. The challenge lies in the advancement of the field of ultrafast magnetisation processes into the regime of a few femtoseconds to nanoseconds, a topic not yet well explored. A general aim is to understand the fundamental mechanisms needed for applications in ultrafast magneto electronic devices. The fundamental topic to be addressed is the response of the magnetisation of small structures upon the application of pulsed magnetic fields, laser pulses or injected spin polarised electron pulses on short time scales, ranging from a small disturbance of the system up to the reversal of the magnetisation direction. The priority programme brings together researchers with expertise in ultrafast processes on the time scale of femtoseconds, with experience in collective excitations on the picosecond time scale, and in experience in coherent remagnetisation and in macroscopic domain effects on the nanosecond time scale. Both theoretical and experimental work will be conducted in close collaboration. The potential for these experiments has evolved from the recent availability of new methods and techniques. Pump-probe experiments with femtosecond laser systems and the employment of ultrashort magnetic field pulses, generated by miniaturised coils and waveguides are made. The development of new techniques for high resolution microscopy with added temporal resolution by the employment of short laser pulses, and the development of novel detectors are strongly encouraged.