SPP 1133: Ultrafast magnetization processes

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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.