SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 3: Posters Magnetism I
MA 3.8: Poster
Monday, September 27, 2021, 13:30–16:30, P
Nucleation site density & magnetization reversal in exchange-biased 1D nanostructures — •Sapida Akhundzada1,3, Meike Reginka1, Maximilian Merkel1, Kristina Dingel2,3, Bernhard Sick2,3, Arno Ehresmann1,3, and Michael Vogel1,3 — 1Institute of Physics & Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel — 2Intelligent Embedded Systems, University of Kassel, Wilhelmshöher Allee 73, D-34121 Kassel — 3AIM-ED - Joint Lab Helmholtzzentrum für Materialien & Energie, Hahn-Meitner-Platz 1, D-14109 Berlin
The interface-driven exchange bias (EB) effect [1] is a well-studied phenomenon observed in ferromagnetic (FM)/antiferromagnetic (AFM) thin film systems. In numerous studies, asymmetric hysteresis loops have been observed in EB thin films mainly caused by defects in the FM or AFM layer contributing to a locally inhomogeneous EB landscape. In full film samples, Romanens et al. [2] were able to correlate these asymmetries to higher domain nucleation densities for an antiparallel configuration of the applied field and the EB field. Here we report on the correlation between the nucleation site density and asymmetric remagnetization process in in-plane magnetized EB nanowires investigated by high-resolution optical Kerr microscopy. The influence of the structural dimensions, the EB material system, and additional modification of the interface by keV He ion bombardment are shown.
[1] W. H. Meiklejohn, J. Appl. Phys. 33, 1328 (1962)
[2] F. Romanens et al, Phys. Rev. B 72, 134410 (2005)