Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 7: Micro- and Nanostructured Magnetic Materials I
MA 7.6: Vortrag
Montag, 27. März 2006, 16:15–16:30, HSZ 03
Real space observation of dipolar interaction in arrays of iron and permalloy elements — •Guido Meier1, Markus Bolte1, Rene Eiselt1, Ulrich Merkt1, Dong-Hyun Kim2, and Peter Fischer2 — 1University of Hamburg, Institute of Applied Physics and Microstructure Advanced Research Center Hamburg, Jungiusstr. 11, 20355 Hamburg — 2Center for X-Ray Optics, Lawrence Berkeley National Lab, 1 Cyclotron Road, Mail Stop 2R0400, Berkeley, CA 94720, USA
Square lattice arrays of thin micro- and nanoelements of iron and permalloy are investigated by magnetic transmission x-ray microscopy. The influence of dipole interaction is analyzed by varying the inter-element distance, the angle of the applied magnetic field, and the lattice configuration. For the iron squares the magnetostatic field caused by inter-element interaction leads to a substantial stabilization of the center elements of the array [1] comparable to the magnetization process previously found by numerical solution of the Landau-Lifshitz equation for magnetic dot arrays. Micromagnetic simulations show, that for high field strengths the dipolar interaction is collinear with the external field, while in the low-field-regime the strayfields have significant perpendicular components leading to a complex reversal mechanism.
[1] Markus Bolte, Rene Eiselt, Guido Meier, Dong-Hyun Kim, and Peter Fischer, J. Appl. Phys., accepted