SPP 1133:  Ultrafast magnetization processes

• Subject Area: Physics
• Term: from 2002 to 2008
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5471552

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.

• DFG Programme: Priority Programmes
• International Connection: Russia

Projects

• Coherence and dissipation of spin-wave eigen modes in magnetic micro- and nano-structures (Applicant Hillebrands, Burkard )
• Current-induced magnetization instabilities in thin magnetic films: self-consistent Langevin dynamics simulations (Applicant Berkov, Dmitry )
• Domain theory and simulation of micromagnetic dynamics (Applicant Rößler, Ulrich K. )
• Dynamical properties of nanostructured Ferromagnet - Diluted Magnetic Semiconductor Hybrids (Applicants Bacher, Gerd ;  Henneberger, Fritz )
• Dynamical properties of nanostructured Ferromagnet - Diluted Magnetic Semiconductor Hybrids (Applicant Henneberger, Fritz )
• Electronic theory of ultrafast spin dynamics (Applicant Hübner, Wolfgang )
• Energy and angular momentum exchange between electron and spin-system in ferromagnetic films (Applicants Aeschlimann, Martin ;  Bauer, Michael )
• Fabrications of samples for dynamic spin momentum transfer experiments (Applicants Güntherodt, Gernot ;  Reiss, Günter )
• Femtosecond spectroscopy in the far and near field for the investigation of the magnetization-reversal dynamics (Applicant Fumagalli, Paul )
• Fs magnetization dynamics of nanostructures probed by spin-polarized photoelectron emission microscopy (Fs-PEEM) and fs x-ray magnetic circular dichroism (Fs-XMCD) (Applicant Dürr, Hermann A. )
• Interaction of spin waves with domain walls (Applicant Leven, Britta )
• Interdependence of the relaxation of spin and charge degrees of freedom in ferromagnetic AxByMnO3 compounds during the first ten picoseconds after optical excitation (Applicant Roskos, Hartmut G. )
• Koordinatorantrag (Applicant Hillebrands, Burkard )
• Limitations and extensions of the Gilbert equation, and calculation of material parameters related to spin damping: An ab-initio study (Applicant Fähnle, Manfred )
• Magnetization Dynamics and magnetic microscopy on the picosecond timescale (Applicant Woltersdorf, Georg )
• Magnetization dynamics of antiferromagnetic compounds by nonlinear optical spectroscopy (Applicant Fiebig, Manfred )
• Magnetization dynamics of antiferromagnetic compounds by nonlinear optical spectroscopy (Applicant Reimann, Klaus )
• Magnetization dynamics of ferromagnetic rare earth metals induced by femtosecond laser excitation (Applicant Bovensiepen, Uwe )
• Magnetization dynamics of synthetic MRAM free layers: coupled precession and ultra fast magnetization reversal strategies (Applicants Reiss, Günter ;  Schumacher, Hans-Werner )
• Optically induced ultrafast magnetization dynamics in the vicinity of phase transitions in nanostructures (Applicant Bauer, Andreas )
• Single shot measurements of current-induced domain wall dynamics in magnetic nanostructures (Applicant Rüdiger, Ulrich )
• Spin current effects in nanostructured films (Applicant Münzenberg, Markus )
• Spin-polarized image-potential-state electrons as ultrafast magnetic sensors in front of ferromagnetic surfaces (Applicants Donath, Markus ;  Weinelt, Martin )
• Spin-polarized image-potential-state electrons as ultrafast magnetic sensors in front of ferromagnetic surfaces Englisch: (Applicant Weinelt, Martin )
• Spin wave excitation by spin-polarized electric current in all-metallic and tunnel magnetic junctions (Applicants Demokritov, Ph.D., Sergej O. ;  Reiss, Günter )
• Stroboscopic domain imaging by Kerr microscopy (Applicant Schäfer, Rudolf )
• Theory of excitation and relaxation of magnetic systems in the femto-second range (Applicant Bringer, Andreas )
• Time- and frequency-domain investigations of spin-transfer-driven nanomagnet dynamics (Applicant Beschoten, Bernd )
• Time resolved imaging of magnetic nanostructures with magnetic transmission soft X-ray microscopy (Applicant Fischer, Peter )
• Time resolved studies of coherent spin waves in ferro/antiferromagnetically coupled exchange bias systems (Applicant Beschoten, Bernd )
• Ultrafast generation and manipulation of ferromagnetic order (Applicant Back, Christian )
• Ultrafast remagnetization processes: stochastic dynamics study using the correlated random noise (Applicant Gorn, Natalia )
• Ultraschnelle Magnetisierungsprozesse in Mikro- und Nanomagneten (Applicant Bayreuther, Günther )
• Zeit- und ortsaufgelöste Beobachtung von Magnetisierungsdynamik unter Verwendung von "Spin-polarized low energy microscopy" (SP-LEEM) (Applicant Elmers, Hans-Joachim )

• Spokesperson: Professor Dr. Burkard Hillebrands