Modeling magnetic nanotubes using a chain of ellipsoid-rings approach

Numerical calculation of magnetic properties is a very effective way to understand the whole magnetic behavior of nanotubes. Currently, the most studies of calculation of magnetic properties of nanotubes are mainly grounded on the Stoner-Wohlfarth model, starting from an elongated prolate ellipsoid with single domain. But, it is hard to imagine how such an ellipsoid is arranged in the hollow tubular structure, and hence, the realization of predicted magnetic properties has been hindered by the experimental difficulties. In the present article, an alternative model of a chain of ellipsoid-rings is proposed to calculate the magnetic properties of nanotubes, where the chain of rings with ellipsoid particles is assumed to compose a nanotube. Based on this new model, we calculate the magnetic properties of a nanotube and further discuss the influence of tubular geometric parameters on the magnetic properties. All the results are well consistent with the experimental data of a Ni nanotube and, moreover, are ava...

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