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

• Published in: Физика низких температур
• Date: 2017
• Main Author: Sidorenko, A.S.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2017
• Subjects: Сверхпроводящие и мезоскопические структуры. К 70-летию со дня рождения А.Н. Омельянчука
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/129527
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics / A.S. Sidorenko // Физика низких температур. — 2017. — Т. 43, № 7. — С. 962-968. — Бібліогр.: 50 назв. — англ.

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 super-conducting 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.