Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Magnetic Coupling Phenomena/ Exchange Bias
MA 4.8: Vortrag
Montag, 22. März 2010, 12:45–13:00, H22
Magnetization in a epitaxial [Fe/Cr/Co/Cr]20x spin valve system — •Frank Brüssing1, Boris Toperverg1, Kirill Zhernenkov1, Maximilian Wolff1, Hartmut Zabel1, Katharina Theis-Bröhl2, Carsten Wiemann3, Alexander Kaiser3, and Claus M. Schneider3 — 1Department of Physics, Ruhr-University Bochum — 2University of Applied Sciences Bremerhaven — 3Institut für Festkörperforschung, Forschungszentrum Jülich GmbH
Magnetic heterostructures containing different magnetic layers, such as Co and Fe, are essential elements for modern spintronic devices. As a model system we have chosen [Co/Cr/Fe/Cr(100)]20x epitaxial superlattices with spin valve properties. The thicknesses of the Fe and Co layers were adjusted such that their magnetization magnitudes are roughly equal. The quality of the layering and the epitaxial relationship were verified via x-ray methods. Via PEEM and PNR the ground state and the magnetization reversal were studied. In this work we mainly focused on the magnetic correlation between Co and Fe mediated by Cr spacer layer and its dependence on the Co bcc-hcp martensitic transition. The alignment between neighboring Co and Fe layers can be recognized via intensity variations of the superlattice Bragg peaks, which are different for odd and even orders. For a certain thickness of the Co and Fe layers in the as grown state additional half-order peaks can be recognized, which indicate a spiral like magnetic ordering in the sample. A combination of the magnetic anisotropy of the different layers and interlayer exchange coupling is most likely the reason for the spiral state. This project was supported by the DFG via SFB491.