Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Magnetic Thin Films I

MA 46.2: Vortrag

Donnerstag, 19. März 2015, 15:15–15:30, H 1012

Topological defect evolution and transverse instability in magnetic stripe domain patterns — •Michael Zimmermann, Thomas Meier, Matthias Kronseder, and Christian Back — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Deutschland

Magnetic phase transitions in ultra thin films have long been the subject of extensive studies. Particular interest has been dedicated to the spin reorientation transition found in some ultra thin magnetic films with perpendicular anisotropy. Here, the evolution of stripe domain patterns into less ordered phases (i.e. disordered phase) is investigated. Emphasis is placed on the development of topological defects within single stripe domains when heated. The generation of topological defects is closely related to the effect of transverse instability. To quantitatively describe the domain state, numerical order parameters are used. Besides heating, also cooling experiments have been conducted. Thereby the inverse effect of transverse instability could be observed. We use a laboratory based imaging technique with high spatial resolution, which is threshold photoemission magnetic circular dichroism (TP-MCD) in combination with photoemission electron microscopy (PEEM). All measurements were conducted on ultra thin Ni/Fe/Cu(001) and Fe/Ni/Cu(001) samples, since both offer an out-of-plane magnetization direction if the layer thicknesses are chosen properly.