Electric transport properties of Pt/Permalloy bilayers in the presence of an external magnetic field |
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Authors: | Peter Weinberger |
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Affiliation: | 1. Center for Computational Nanoscience , Seilerst?tte 10/22, Vienna, A-1010 , Austria;2. Department of Physics , New York University , 4 Washington Place, New York , NY 10003 , USA weinberger@computational-nanoscience.de |
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Abstract: | A recent experimental study of the electric properties of Pt/Permalloy bilayers based on a simultaneous application of an in-plane microfrequency current and an external magnetic field is simulated on a fully relativistic ab initio level by considering the resistivity as an implicit function of the free energy. It is found that the oscillations detected experimentally are caused by the different behavior of out-of-plane and in-plane resistivities in the vicinity of that value of the free energy that corresponds to the resonant field induced by the applied current. A necessary precondition for such oscillations is a sizeable perpendicular anisotropy, which is not the case in systems consisting only of Permalloy. It is shown that the observed phenomenon is essentially an interface effect. |
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Keywords: | anisotropic properties electrical properties electrical transport interfaces magnetic anisotropy spin dynamics magnetic films magnetic multilayers spintronics |
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