Magnetization reversal of submicrometer Co rings with uniaxial anisotropy via scanning magnetoresistance microscopy
نویسندگان
چکیده
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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