We study the temperature dependence of the critical current density, Jc(T) of a Nb/PdNi bilayer before and after the application of a magnetic field oriented either out of theplane or in the plane of the substrate. Nb and PdNi layers interact through both electromagnetic and proximity coupling. The values of Jc strongly depend on the magnetic history of the samples. Indeed, the Jc values measured when the PdNi is in the outofplane remanent state are reduced by a factor of two, in the whole investigated temperature range, compared to the case when the PdNi is in the demagnetized state. This behavior can be accounted for by the outofplane magnetocrystalline anisotropy of the PdNi layer producing stray fields which, in turn, can induce a spontaneous vortex phase in the Nb layer. The topology of these vortices is strongly modified by the proximity coupling as confirmed by theoretical calculations. The Jc values are only weakly affected by the inplane remanence of the PdNi layer.

Magnetic memory effect in type-II superconductor/ferromagnet bilayers

CIRILLO, CARLA;ATTANASIO, Carmine
2014-01-01

Abstract

We study the temperature dependence of the critical current density, Jc(T) of a Nb/PdNi bilayer before and after the application of a magnetic field oriented either out of theplane or in the plane of the substrate. Nb and PdNi layers interact through both electromagnetic and proximity coupling. The values of Jc strongly depend on the magnetic history of the samples. Indeed, the Jc values measured when the PdNi is in the outofplane remanent state are reduced by a factor of two, in the whole investigated temperature range, compared to the case when the PdNi is in the demagnetized state. This behavior can be accounted for by the outofplane magnetocrystalline anisotropy of the PdNi layer producing stray fields which, in turn, can induce a spontaneous vortex phase in the Nb layer. The topology of these vortices is strongly modified by the proximity coupling as confirmed by theoretical calculations. The Jc values are only weakly affected by the inplane remanence of the PdNi layer.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4361655
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