Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.49: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Characterization of nanostructured PdFe-alloy dots — •Alexandra Schumann, Melanie Ewerlin, Frank Brüssing, and Hartmut Zabel — Ruhr-Universität Bochum, Experimentalphysik 4
We have investigated the magnetic properties of PdFe alloy films and nanostructured PdFe-alloy dots. The dots were prepared by means of e-beam lithography and have diameters in the range of 200nm to 800nm and are placed on a grid with rectangular symmetry. Our aim is to investigate magnetic phase transitions in laterally structured dot arrays. As the critical temperature Tc increases with increasing Fe-concentration of the alloy, we can tune Tc of the individual dot as well as of the array. It is possible to “reset” the magnetic state of the film and/or the patterns by warming up the sample to the paramagnetic state. After cooling, the sample reaches a “virgin” demagnetized ferromagnetic state. To achieve a stable single domain state in each dot, it is necessary to develop a phase diagram, which shows the dependence of the single domain state on the film thickness and the dot diameter. This phase diagram will be shown here.
This work was supported by the SFB 491.