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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.26: Poster

Tuesday, February 26, 2008, 15:15–18:30, Poster E

Training and temperature effects of epitaxial and polycrystalline Ni80Fe20/Fe50Mn50 exchange biased bilayers — •Marian Fecioru-Morariu1, Jerzy Wrona2, Cristian Papusoi3, and Gernot Güntherodt11Physikalisches Institut (IIA), RWTH Aachen University, 52056 Aachen, Germany — 2AGH University of Science and Technology, 30-059 Krakow, Poland — 3SPINTEC, CEA/CNRS, 38054 Grenoble Cedex 9, France

For exchange biased bilayers of Ni80Fe20/Fe50Mn50, the effects of crystalline structure on the training effect of the exchange bias field (HEB) and of the coercive field (HC) have been investigated for (001) and (110) epitaxial as well as polycrystalline thin film samples [1]. The training effect of HEB and HC at 5 K is strongest for the polycrystalline sample as compared to the (110)-oriented sample. The training effect is found to originate from the hysteresis cycle-number dependence of H1, the switching field of the descending branch of the hysteresis loop. A very good qualitative agreement is observed between the cycle-number dependence of HEB and of the fraction of uncompensated spins of the AFM. In the temperature range between 5 K and 300 K, HEB and HC are found to depend strongly on the crystalline structure and orientation of the FM/AFM bilayers. // The financial support through the EU Research Training Network NEXBIAS (HPRN-CT-2002-00296) is gratefully acknowledged. [1] M. Fecioru-Morariu, et al., submitted.

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