Minimizing energy losses by introducing periodic pinning centers on superconducting films
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We study vortex behavior in a set of samples of a rectangular array of antidots on a high-quality metallic superconducting Nb film. For this purpose, we measure magneto-resistance properties of some samples with varying dimensions, and also varying periods of antidots in the array. In the first phase, we characterize magneto-resistance curves of the samples with large period having weak pinning effect. The vortex array, due to the interstitial vortices being dominant, rapidly becomes disorder causing high differential resistance. Later, we measure the same curves with smaller period of the samples, and observe a strong pinning effect mainly due to the fact that the vortex array remains in order. We demonstrate that by decreasing the period of samples, energy loss in nano-engineered thin films may be minimized.
KeywordsMixed state Energy Vortices Critical fields Antidots
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