Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.73: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Formation and evolution of domain patterns and topological defects in antiferromagnetically coupled perpendicularly magnetized multilayers — •Nikolai Kiselev1, Volker Neu1, Ulrike Wolff1, Cristina Bran2, Olav Hellwig3, Alex Bogdanov1, and Ulrich Rößler1 — 1IFW Dresden, Germany — 2Uppsala University, Sweden — 3Hitachi GST, San Jose, USA
Ground states in magnetic multilayers with strong perpendicular anisotropy and antiferromagnetic (AF) interlayer exchange coupling (IEC) as [Co/Pt(Pd)]/Ru or [Co/Pt]/NiO are (i) multidomain states with ferromagnetic (FM) arrangement of magnetization through the whole multilayer and (ii) the homogeneous state with AF arrangement in adjacent layers [1]. Within the homogeneous AF state, there are different types of defects which exist as a metastable state. These defects are composed of irregular networks of isolated 180-degree domain walls in FM layers which are coupled via interlayers and stabilized by the competition between IEC and magnetostatic interaction. We distinguish sharp domain wall, ferroband and tiger tail (TT) defects [2]. Theoretical analysis using micromagnetic domain models shows that TT patterns cannot be stabilized by the interplay between magnetostatic and IEC energies only, but can be stabilized by domain wall pinning. We present a theoretical and experimental study of nucleation and evolution of these defects in magnetic fields in [Co/Pt]/Ru multilayers.
[1] N. S. Kiselev, et al., Appl. Phys. Lett. 93, 162502 (2008); [2] N. S. Kiselev, et al., J. Magn. Magn. Mater. 322, 1340-1342 (2010);