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We have investigated the magnetization reversal mechanism of narrow submicrometer Co rings using scanning magnetoresistance microscopy. Thermal annealing in a magnetic field introduced a uniaxial anisotropy and significant structural changes in the samples. We have observed a complicated multidomain state at intermediate field ranges, and onion states at saturation, for samples annealed in a field. This observation is in contrast to the flux-closed vortex state for unannealed rings. Micromagnetic simulations have shown that the switching occurs through a gradual noncoherent buckling-like reversal process followed by coherent rotation.
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Liu et al. (2004) studied this question.
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