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MA: Magnetismus
MA 15: Magnetische Kopplungsph
änomene / Exchange Bias
MA 15.4: Talk
Saturday, March 5, 2005, 14:45–15:00, TU H1028
Magnetic domain structure dependence of the exchange-bias field in exchange-coupled ferrimagnetic bilayers — •M. Ziese1, R. Höhne1, A. Bollero1, H. C. Semmelhack1, P. Esquinazi1, and K. Zimmer2 — 1University of Leipzig, Division of Magnetism and Superconductivity, Linnéstrasse 5, 04103 Leipzig — 2Institute for Surface Modification, 04318 Leipzig
Exchange biasing was studied in an exchange-spring system consisting of two ferrimagnetic films with different coercivity. Magnetite and Co-Fe ferrite were chosen as the soft and hard magnetic bilayer components, respectively. The samples were epitaxially grown on MgO single crystal substrates by pulsed laser deposition. The exchange-bias field was investigated as a function of system size and shape, magnetic field direction and magnetization reversal in the hard layer. A clear dependence of the exchange-bias field on the sample size and shape was found. This was attributed to an interplay between exchange and dipolar energies. Micromagnetic simulations support the experimental results.