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MA: Fachverband Magnetismus

MA 13: Magnetic Materials II

MA 13.7: Talk

Tuesday, March 8, 2016, 11:00–11:15, H31

Flux transfer across domain walls in the patterned Permalloy thin films — •Sukhvinder Singh, Haibin Gao, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P O. Box 151150, D-66041, Saarbrücken, Germany

Magnetic domain walls are subjects of intense fundamental research on controlling, manipulating and moving their internal configuration [1]. We have investigated the mechanism of magnetic flux transfer across domain walls in patterned Permalloy thin films under static magnetic field induced magnetization reversals. High-resolution images of cross-tie domain walls and asymmetric domain walls [2] were obtained by magnetic force microscopy for 40 nm and 130 nm thick Permalloy structures, respectively. The transformations between different internal structures of domain walls were studied by applying in-plane magnetic fields. The motion of the vortices, antivortices and line singularities [2] was tracked along the domain walls in order to understand the magnetization reversal of domain walls. The experimental results were compared to three-dimensional micromagnetic simulations to link these internal transformations to wall energies.

[1] J.Y. Lee et al., Phys. Rev. B 76, 184408 (2007) [2] A. Hubert, and R. Schafer, Magnetic Domains (Springer Verlag, Berlin, 1998)