Dresden 2011 – scientific programme

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.16: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Magnetization reversal in dipolarly coupled PdFe nanodot arrays — •Derya Demirbas, Melanie Ewerlin, Frank Brüssing, Oleg Petracic, and Hartmut Zabel — Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

We have studied a 2-dimensional XY macrospin model system by fabricating nanodot arrays from Pd1-xFex with low Fe-concentrations x < 15 % as magnetic material. Pd1-xFex films of 10 nm thickness and various Fe concentrations were deposited by ion beam sputtering and characterized by superconducting quantum interference device (SQUID) magnetometry, magneto-optic Kerr effect (MOKE), atomic force microscopy (AFM) and x-ray diffraction (XRD). For the nanostructuring we used films with x = 11 at% showing a Curie temperature of 230 K. This low Tc ensures that the system can be cooled from a completely paramagnetic state into the macrospin state. We have fabricated circular dots with a diameter of 150 nm on a square lattice with various inter-dot distances. The magnetization reversal of the entire system has been studied using a low-temperature MOKE setup and has been compared to model expectations of a XY system with dipolar interactions.