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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 36: Magnetic Coupling Phenomena / Exchange-Bias

MA 36.5: Talk

Friday, March 31, 2006, 11:45–12:00, HSZ 401

Spatially Resolved Magnetic Reversal in an Exchange Bias System — •Kai Schlage1, Torsten Klein1, Eberhard Burkel1, and Ralf Röhlsberger21Universität Rostock, August-Bebel-Str. 55, 18055 Rostock — 2HASYLAB @ DESY, Notkestr. 85, 22607 Hamburg

We present the coupling behaviour of a novel exchange bias system during the reversal of the ferromagnet. Our system consists of a Fe-layer on an antiferromagnetically coupled Fe/Cr-superlattice. This layer system was deposited on a hardmagnetic FePt-layer which pins the first Fe-layer of the superlattice to induce a unidirectional magnetic anisotropy into the AFM. MOKE-hysteresis loops show exchange-bias like effects like shifted and asymmetric swithing behaviour of the FM. We use nuclear resonant forward scattering (NRS) of synchrotron radiation to visualize the magnetic reversal of isotopic 57Fe sensor layers which are placed in the center of the FM and in the AFM near the interface in two identical exchange bias systems. We detected the magnetic moment orientation in the FM and AFM during the magnetic reversal of the FM and got information about the mechanism which is responsible for the asymmetric switching behaviour in this novel exchange bias system. Due to a special detection procedure we can discriminate reversal processes of coherent rotation and domain wall motion.

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