Contribution submission to the conference Berlin 2015

Contribution submission to the conference Berlin 2015
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, vortexantivortex 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)
Part:
Type:
Topic:
Email:
MA
Poster
Magnetische Materialien; Magnetic
Materials
[email protected]