Fundamental phenomena in magnetic systems -
Research areas of the department
The scientific direction of the Department Schütz aims in the exploration of phenomena and design of mirco- to nanoscaled materials with the focus of magnetic systems.
The core area of the department activity is the development and application of element specific x-ray related methods as absorption spectroscopy, resonant reflection and scattering and x-ray microscopy on the basis of X-ray Magnetic Circular Dichroism (XMCD). Therefore, experimental equipment for absorption- and scattering techniques have been developed in the department, which are attached to the storage rings BESSY II in Berlin and ANKA at Karlsruhe (X-Ray Spectroscopy). At BESSY II the department runs the unique x-ray microscope MAXYMUS (Magnetic X-raY Microscope with UHV Spectroscopy ), which provides a combination of lateral and temporal resolution down to 15 nm and 10 psec with high magnetic contrast (X-Ray Microscopy). In the department characterization tools such as several SQUID magnetometer, NanoMOKE, Kerr-micorscopy, AFM and MFM are available (Equipment).
A large variety of phenomena in the field of magnetic solid state physics are investigated such as the origin of exchange bias, microstructural characteristics of super magnets and d0 magnetism in oxides and ceramics (X-Ray Spectroscopy). One specific focus lies on the exploration of the magnetization dynamics of vortex structures and spin wave propagatipon in specially designed nano structures (Magnetizationdynamics and Nano Magnonics). We furthermore investigate fascinating phenomena in ferromagnet/superconductor hybrides and develope eligible magnetic sensor layers for nano-imaging the flux density distribution with scanning x-ray microscopy (FM/HTc Superconductor Systems).
In the field of material development and sample preparation the department has concentrated on the fabrication of epitaxial and polycrystalline thin films, defined large area assemblies of nanostructures by imprint and Focused Ion Beam (FIB) technologies, sputtered ferromagnetic rare earth transition metal layers and on the production of hard magnetic phases via rapid quenching. Furthermore, novel processes for the realization of new Fresnel zone lenses via Atomic Layer Deposition (ALD) and FIB techniques are under development (Micro/Nano Optics).
The activities of the theory group (Electron Theory) include electron theories of dissipative magnetization dynamics in the frame of time scales as investigated by the experimental groups of the department (e.g., vortex dynamics) and in the femto second range, the dynamics after irradiation with optical fs laser pulses.
Another group in the department Schütz investigates hydrogen storage by physisorption in novel, highly porous solids as metal-organic frameworks with the aim of optimizing these materials for technical applications in hydrogen tanks (Hydrogen-Storage).