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MA: Fachverband Magnetismus

MA 18: Magnetic Coupling Phenomena

MA 18.7: Vortrag

Dienstag, 1. April 2014, 15:30–15:45, HSZ 403

Annealing temperature dependence and stability towards external magnetic fields of the exchange bias field in Mn₈₃Ir₁₇/Co₇₀Fe₃₀-bilayers — •Timo Ueltzhöffer, Alexander Gaul, Sebastian Kübler, Dennis Holzinger, and Arno Ehresmann — Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

The annealing temperature dependence of the exchange bias field of sputter deposited Mn₈₃Ir₁₇/Co₇₀Fe₃₀-bilayers and their stability towards external magnetic fields at different temperatures is studied. By further developing the York protocol (YP) [1], a measurement sequence for reproducible determination of the blocking temperature, reproducible results for the characteristic blocking temperature (T_B,YP = 458 K) as well as the activation temperature (T_act = 360 K) could be determined. With the experimental results an estimate of the grain size distribution in the antiferromagnet was achieved.

[1] K. O’Grady, L.E. Fernandez-Outon and G. Vallejo-Fernandez, J. Magn. Magn. Mater. 322, 883 (2010)