Research topics
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SQUID-magnetometry on powders of magnetic nanoparticles Ultra small magnetic particles (>4nm) are magnetized by a small alternating magnetic field of 1kHz. The response of the AC-susceptibility shows a T-peak for the in-phase and out-of phase susceptibility which represents the magnetic blocking temperature and is a measure for the particles´ size distribution. Note accuracy of the fit which determines the particle diameter of γ-Fe2O3-particles as 6.8nm within +/-0.5nm. |
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Nuclear Magentic Resonance in solids with strong electronic correlations NMR is a local probe of electronic properties of solids. A home-made broad band pulse spectrometer tailored for measurements in solids magnetically ordered or close to magnetism is used to investigate Rare-Earth Transition metal Boron-Nitridess, where electronic correlations lead to superconductivity, and classical magnetic materials, where nanostructuring introduces new properties. |
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Photoacoustic imaging Photoacoustic (or optoacoustic) imaging combines advantages of optical and ultrasound imaging methods and is particularly suited for visualizing turbid media with absorbing inclusions, such as biological tissue. |
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Characterization of severely plastically deformed materials by laser ultrasound Laser-induced generation of broadband acoustic waves are investigated as a method to study ultrasound attenuation and elastic constants of materials. |
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Low dimensional systems – magnetic phase transitions in ultra-thin layers Eu-chalcogenides like EuTe (pure type II Heisenberg antiferromagnet) and EuSe are investigated by SQUID-magnetometry. Superlattices of ML’s exhibit a substantially different behaviour than bulk material. |
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Magnetic properties of nanostructured systems SQUID-measurements of Ni-particles with a NiO shell (fabricated at RWTH Aachen, U. Kreibig). |
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Magnetic measurements on ferromagnetic diluted semiconductors MOCVD grown Fe doped GaN layers (Univ. Linz, A. Bonanni) are measured by SQUID- magnetometry. |
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Magnetic properties of Fe-Co ferritic steel FeCo ferritic steel is investigated after severe plastic deformation. The obtained microstructural sizes depend on the deformation temperature and influence significantly the magnetic properties. |
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Modeling of pulsed laser-tissue interactions Stress wave generation and phase changes associated with absorption of pulsed laser radiation in biological tissue are studied theoretically and experimentally. |
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