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Regular version of the site

Article

Superconducting spin-valve effect in heterostructures with ferromagnetic Heusler alloy layers

Physical Review B: Condensed Matter and Materials Physics. 2019. Vol. 100. P. 134511-1-134511-11.
Kamashev A., Garif’yanov N., Validov A., Schumann J., Kataev V., Büchner B., Fominov Ya.V., Garifullin I.

This article represents a mini review of our obtained results about of superconducting spin-valve effect in heterostructures with ferromagnetic Heusler alloy layers.
We have analysed and compared the superconducting properties of the spin-valve structures containing the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al$_{y}$ as one
of two ferromagnetic (F1 or F2) layers of the F1/F2/S structure, where S stands for the superconducting Pb layer. In these experiments we used the
Heusler alloy layer in two roles: as a weak
ferromagnet on the place of the F2 layer and as a half-metal on the
place of the F1 layer. In the first case, we obtained a large
ordinary superconducting spin-valve effect $\Delta T_c$ assisted by
the triplet superconducting spin-valve effect $\Delta T_c^{trip}$.
In the second case, we observed a giant magnitude of $\Delta
T_c^{trip}$ reaching 0.5 K. An underlying theory based on the solution of the Usadel
equations using Kupriyanov-Lukichev boundary conditions with
arbitrary material parameters for all layers and arbitrary boundary
parameters for all interfaces is presented. We find a good agreement between our experimental data and theoretical results.