Vortex states in patterned exchange biased NiO/Ni samples

Details Vortex states in patterned exchange biased NiO/Ni samples Vortex states in patterned exchange biased NiO/Ni samples

2008-06-28

arxiv.org/abs/0806.4700v2

J. Appl. Phys. 106, 033909 (2009)

Physics

Condensed Matter

Materials Science

6 pages, 7 figures

Scientific paper

10.1063/1.3186021

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 $\mu$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 $\mu$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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