|Multiple order parameter conﬁgurations in superconductor/ferromagnet multilayers
|Prischepa, S. L.
Kushnir, V. N.
Kupriyanov, M. Yu.
|публикации ученых;superconductor/ferromagnet multilayers;multiple order parameter conﬁgurations
|Multiple order parameter conﬁgurations in superconductor/ferromagnet multilayers / V. N. Kushnir and others. - Physical review B 84, 2011. – Pp. 214512.
|he coupling of two superconductors (S) through a ferromagnet (F) can lead to either a zero- or a π-phase difference between the superconducting banks. Most research in this area is performed on trilayer S/F/S ﬁlm structures, in which two-order parameter conﬁgurations are possible. Increasing the number of layers and junctions leads to a larger number of possible conﬁgurations with, in principle, different properties such as the superconducting transition temperature Tc. Here we study the behavior of a series of multilayers made of superconducting Nb and ferromagnetic Pd81Ni19. We ﬁnd that for the individual layer thicknesses used, the transition width Tc increases with increasing number of bilayers in the multilayer, in a well-deﬁned manner. That the broadening is not simply due to increased disorder in the larger stacks, it is shown from x-ray diffraction, which ﬁnds very sharp interfaces for all samples; and from the effect of the magnetic ﬁeld on the transition, which shows a considerable sharpening. We can make a connection with the various order parameter conﬁgurations using a matrix formulation of quasiclassical theory based on the Usadel equations and show that these different conﬁgurations take part in the Josephson networks, which are building up in the transition to the superconducting state.
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