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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.32: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Long and short term changes of the exchange bias field in MnIr/CoFe bilayers after ion bombardment with 10keV He ions — •Christoph Schmidt, Jörn Burbank, Niklas Stein, Tanja Weis, Dieter Engel, and Arno Ehresmann — Department of Physics, University of Kassel, Heinrich-Plett-Str.40, D-34132 Kassel

The stability and time dependence of the exchange bias (EB) field after 10 keV He⁺ ion bombardment (IB) were studied. The long term measurements were done ex-situ in a time window between half an hour and several weeks after IB and the short term measurements in-situ between a few seconds and half an hour after IB. The following changes were observed: (i) the long term changes have a logarithmic behaviour of the EB field to larger values while (ii) the short term investigations show an exponential decrease of the EB field and a relaxation back to its origin direction of the unidirectional anisotropy. The two different behaviours depend on the time scale of the measurements after IB.