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arXiv · 0806.4700

Vortex states in patterned exchange biased NiO/Ni samples

Pablo Asshoff·Katharina Theis-Bröhl·Oleg Petracic·Hartmut Zabel
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Abstract

We investigated the magnetization reversal of arrays of exchange biased NiO/Ni squares with superconducting quantum interference device magnetometry and micromagnetic simulations. The edges of the squares were 0.5, 1.5, and 3.0 $μ$m long. The NiO/Ni structures exhibit vortexlike hysteresis loops and micromagnetic calculations show that this feature is due to several vortices nucleating in the islands. Furthermore, for the arrays with squares of 1.5 $μ$m edge length, the sign of the exchange bias field changes, as compared to the same continuous NiO/Ni layer. We attribute the vortex nucleation and the change of the exchange bias field to the interplay between shape and unidirectional anisotropy.

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Pablo Asshoff, Katharina Theis-Bröhl, Oleg Petracic, Hartmut Zabel. 2009-08-21. Vortex states in patterned exchange biased NiO/Ni samples. https://doi.org/10.1063/1.3186021

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