Физика Низких Температур: Том 43, Выпуск 7 (Июль 2017), c. 962-968    ( к оглавлению , назад )

Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics

A.S. Sidorenko

D. Ghitsu Institute of Electronic Engineering and Nanotechnologies ASM, MD-2028 Kishinev, Moldova

Institut für Physik, Universität Augsburg, D-86159 Augsburg, Germany
E-mail: anatoli.sidorenko@kit.edu

Received January 2, 2017

Аннотация

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;
PACS: 74.78.Na Mesoscopic and nanoscale systems;
PACS: 73.50.–h Electronic transport phenomena in thin films;
PACS: 74.25.–q Properties of superconductors;
PACS: 85.25.–j Superconducting devices.

Ключевые слова: superconducting films and multilayers nanostructures, superconducting spin valves, interference phenomena.

Published online: May 25, 2017