Regensburg 2000 – scientific programme
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AM: Magnetismus
AM 1: Mikromagnetismus, Magnetisierungsprozesse und Domänenstrukturen I
AM 1.5: Talk
Monday, March 27, 2000, 10:45–11:00, H10
Imaging domains in thin magnetic alloy films and structured multilayer samples with circularly polarised soft x-rays — •U. Muschiol1, O. DeHass1, C.M. Schneider1, N. Cramer2, A. Oelsner3, O. Schmidt3, M. Klais3, G. Fecher3, G. Schönhense3, and W. Jark4 — 1IFW-Dresden, Dresden, Germany — 2UCCS, Colorado Springs, USA — 3University Mainz, Germany — 4ELETTRA, Triest, Italy
Our aim is to investigate the magnetic domain pattern as a function of the material, geometry and size of the structures. Therefore, we employ photoemission electron microscopy (PEEM) with circularly polarised soft X rays for an element-sensitive observation of the magnetic contrast. The experiments were performed at the electromagnetic undulator source 4.2. at ELETTRA/Trieste. The FeNi/NiO/FeNi trilayers and the Co/Cu and FeNi/Cu multilayer samples investigated were prepared ex-situ.The microstructured FeNi/NiO/FeNi samples consisted of two sets of rectangular and elliptical structures, oriented perpendicular to each other and ranging in size from 24 down to 6 m. FeNi being a soft magnetic material one expects classical Landau-Lifshitz domain patterns determined by flux closure arguments. The experiment, however, reveals more complex domain patterns which disobey flux closure. This feature might be caused by the magnetic coupling between the FeNi top layer and the underlying antiferromagnetic NiO film. Thus, otherwise energetically unfavourable domain configurations may be stabilised. The Co/Cu or FeNi/Cu multilayers showed some interesting effects due to the intended antiferromagnetic interlayer coupling and to a certain contend of additional ferromagnetic coupling.