Magnetic memory effect in type-II superconductor/ferromagnet bilayersстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 19 июня 2014 г.
Аннотация:We study the temperature dependence of the critical current density,
Jc(T), of a Nb/PdNi (PdNi=Pd84Ni16) bilayer before and after the application of a
magnetic field oriented either out-of-the-plane 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 out-of-plane 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 the out-ofplane
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 in-plane remanence of
the PdNi layer.