Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.24: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Influence of domain wall substructures on the domain structures of Permalloy elements — •Sukhvinder Singh, Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P O. Box 151150, D66041, Saarbrücken, Germany

Substructures (Bloch lines, cross-tie wall components, vortex-antivortex pairs) of domain walls significantly affect the magnetic properties of patterned materials [1, 2]. In this study we have investigated their influences on the magnetization configurations of microstructured thin films. The patterns were prepared in rectangular shapes of various aspect ratios by means of e-beam lithography. Thin films of Permalloy (Ni81Fe19) in the range of 20 nm to 150 nm thickness were prepared by DC sputtering. Substructures of domain walls were observed by magnetic force microscopy. The results were compared with micromagnetic simulations and the relative contributions of different magnetic energies were investigated. The magnetic energies of the Landau state, the diamond state and cross-tie configurations were calculated. The increase in the total energy and the stabilization of the magnetic flux more efficiently due to the nucleation of new vortex-antivortex pairs was observed. The existence of seven domain states and the change in their statistical distribution were explained in terms of structural variations in dependence of the applied field sweep rate.

[1] C. Y. Kuo et al. J. Magn. Magn. Mater. 310, e672 (2007) [2] C. Zinoni et al. Phys. Rev. Lett. 107, 207204 (2011)