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Abstract: We study the vortex structure in a Pb film deposited on top of a periodicarray of ferromagnetic square microrings by combining two high resolutionimaging techniques: Bitter decoration and scanning Hall probe microscopySHPM. The periodicity and strength of the magnetic pinning potentialgenerated by the square microrings are controlled by the magnetic history ofthe template. When the square rings are in the magnetized dipolar state, knownas the onion state, the strong stray field generated at the domain wallsprevents the decoration of vortices. SHPM images show that the stray fieldgenerated by the dipoles is much stronger than the vortex field in agreementwith the results of simulations. Real space vortex imaging has revealed that,in the onion state, the corners of the square rings act as effective pinningcenters for vortices.



Author: M. Menghini, R. B. G. Kramer, A. V. Silhanek, J. Sautner, V. Metlushko, K. De Keyser, J. Fritzsche, N. Verellen, V. V. Moshchalko

Source: https://arxiv.org/







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