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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.41: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

influence of top Ni layer on exchange bias and blocking temperature in Ni/NiMn/Ni trilayers — •yasser shokr¹, mustafa erkovan^1,2, Daniela schiestl¹, chii-bin wu¹, mohammed yaqoob khan¹, and wolfgang kuch¹ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany. — ²Gebze Institute of Technology, Dept. of Physics, 41400 Kocaeli, Turkey

The exchange bias (EB) field and the blocking temperature for exchange bias (Tb) in the system Y ML Ni/X ML Ni25Mn75/12 ML Ni on Cu3Au(001) were investigated by magneto-optical Kerr effect (MOKE). The study concentrates on the influence of the antiferromagnetic (AFM) layer thickness on the EB field and on Tb. For every AFM layer thickness X the top ferromagnetic (FM) layer thickness Y has been changed from 0ML and then 12 ML to 22 ML in steps of 5 ML. we show that the EB field is reduced after deposition of the top Ni layer. This is interpreted in term of pining of uncompensated moments in the volume of the AFM layer. In addition, magnetic interlayer coupling between the two Ni layers influence the EB field.