Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Micro- and Nanostructured Magnetic Materials I
MA 23.3: Vortrag
Donnerstag, 29. März 2007, 10:45–11:00, H22
Magnetization Reversal of Microstructured Kagomé Lattices — •Andreas Westphalen1, Alexandra Schumann1, Arndt Remhof1, Thorsten Last2, Ulrich Kunze2, Thomas Eimüller3, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Institut für Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 3Nachwuchsgruppe, Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
We report on magneto-optical Kerr effect (MOKE) investigations of microstructured rectangular islands (thickness: 20 nm, lateral size: 4.7 × 0.3 µm2 to 2.7 × 0.15 µm2) arranged as Kagomé lattices. The magnetization reversal was studied by regular longitudinal vector MOKE in specular geometry as well as in Bragg MOKE geometry, using the diffraction spots from the grating for hysteresis measurements. The measurements are compared with the results of micromagnetic simulation, which allow a detailed interpretation of the experimental data. We find that the remagnetization process in an external magnetic field strongly depends on the size and the interparticle spacing between the islands. The magnetization in remanence is imaged using magnetic force microscopy and photoemission electron microscopy. It shows a well ordered state even for sample orientations where strong magnetic frustration has been excepted.
We acknowledge financial support through SFB 491.