Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics
D. Ghitsu Institute of Electronic Engineering and Nanotechnologies ASM, MD-2028 Kishinev, Moldova
Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
Received January 2, 2017
In superconductor/ferromagnet layered structures, a Fulde–Ferrell–Larkin–Ovchinnikov-like inhomogeneous superconducting pairing give rise. The singlet and zero-projection triplet components of the pairing oscillate in space, and the presence of interfaces causes interference phenomena. As the result of the interference, the superconducting critical temperature Tc oscillates as a function of the ferromagnetic layer thicknesses or, even more spectacular, reentrant superconductivity appears. Two ferromagnetic layers can be combined with a superconducting layer into a superconducting spin valve. Proper design and choice of the material parameters give possibility to control superconducting Tc manipulating with magnetic configurations in the system. The conditions to get large spin-valve effect, i.e., a large shift in the critical temperature, are reviewed in the article.
PACS: 74.78.–w Superconducting films and low-dimensional structures;
Key words: superconducting films and multilayers nanostructures, superconducting spin valves, interference phenomena.
Published online: May 25, 2017
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ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)