Regensburg 2010 – scientific programme
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KR: Fachverband Kristallographie
KR 10: Poster: Multiferroics (with MA, DF, KR, DS)
KR 10.50: Poster
Tuesday, March 23, 2010, 10:45–13:45, Poster A
Imaging of magnetic coupling in trilayerd microstructures — •Julia Kurde1, Jorge Miguel1, Daniela Bayer2, Jaime Sánchez-Barriga3, Logane Tati Bismaths3, Martin Aeschlimann2, Hermann A. Dürr3, and Wolfgang Kuch1 — 1Freie Universität Berlin — 2Technische Universität Kaiserslautern — 3Helmholtz-Zentrum Berlin für Materialien und Energie
Magnetic properties of microstructures consisting of either an FeNi single layer or an FeNi/Cu/Co trilayered system were investigated by means of photoelectron emission microscopy. We performed stroboscopic pump-probe experiments to determine the precession frequencies and the effective field of the FeNi layer. From the comparison of these measurements to micromagnetic simulations, the coupling field in the trilayered systems could be extracted. This information can then be used to explain the observed domain wall (DW) configurations in the FeNi layer. The parallel coupling of the two magnetic layers via the non-magnetic spacer layer is dominated by Néel coupling. However, the strong stray field of the DWs in the Co layer forces the magnetization to align antiparallel in the two layers, and so to turn with opposite sense of rotation from domain to domain. In 180° walls, a left turn is symmetric to a right turn, but in 90° walls of the Co layer, this will lead to a 270° turn of the magnetization in the FeNi layer. Although this case is highly unfavorable with respect to the exchange interaction within the FeNi layer, it still occurs if the Cu spacer layer reduces sufficiently the Néel coupling to the Co layer.
This work has been supported by the BMBF 05 KS7 KE2