Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Magnetic Coupling Phenomena/ Exchange Bias
MA 4.3: Talk
Monday, March 14, 2011, 11:30–11:45, HSZ 403
Magnetostatic coupling of 90° domain walls in FeNi/Cu/Co trilayers — •Julia Kurde1, Jorge Miguel1, Daniela Bayer2, Jaime Sánchez-Barriga3, Florian Kronast3, Martin Aeschlimann2, Herrmann A. Dürr3, and Wolfgang Kuch1 — 1Freie Universität Berlin — 2Technische Universität Kaiserslautern — 3Helmholtz-Zentrum Berlin für Materialien und Energie
The magnetic interlayer coupling of FeNi/Cu/Co trilayered microstructures has been studied by means of x-ray magnetic circular dichroism in combination with photoelectron emission microscopy (XMCD-PEEM). We find that a parallel coupling between magnetic domains coexists with a non-parallel coupling between magnetic domain walls of each ferromagnetic layer. We attribute the non-parallel coupling of the two magnetic layers to local magnetic stray fields arising at domain walls in the magnetically harder Co layer. In the magnetically softer FeNi layer non-ordinary domain walls such as 270° and 90° domain walls with overshoot of the magnetization either inwards or outwards relative to the turning direction of the Co magnetization are identified. Micromagnetic simulations reveal that in the absence of magnetocrystalline anisotropy, both types of overshooting domain walls are energetically equivalent. However, if a uniaxial in-plane anisotropy is present, the relative orientation of the domain walls with respect to the anisotropy axis determines which of these domain walls is energetically favorable. This work is supported by the BMBF (05 KS7 UK1/05 KS7 KE2).