Superconducting spintronics: state of the art and perspectives
A.I. Buzdinc aInstitute for Physics of Microstructures, Russian Academy of Sciences, ul. Ul'yanova 46, Nizhnii Novgorod, 603950, Russian Federation bLobachevsky State University of Nizhny Novgorod (National Research University), prosp. Gagarina 23, Nizhny Novgorod, 603950, Russian Federation cUniversity of Bordeaux, LOMA UMR-CNRS 5798, Talence Cedex, F-33405, France
The review is devoted to the rapidly developing branch of low-temperature electronics, namely, the physics of superconducting hybrid structures based on superconductors (S) and ferromagnets (F) which is often called superconducting spintronics. We discuss the ground theoretical and experimental results on the proximity effect with a ferromagnet, which forms unusual superconducting state near the S/F interface and enables the control of dissipationless charge and spin transport in hybrid structures by changing the texture and properties of magnetic subsystem. We pay specific attention to the features of the spin-triplet Cooper pairs generation at S/F interfaces which provide the effective mechanism for the interplay between superconductivity and ferromagnetism in different S/F hybrids including the systems with half-metals and sufficient spin-orbit coupling. In contrast to the previous review papers devoted to superconducting spintronics, we focus on the electrodynamic phenomena in S/F hybrids, including the formation of non-uniform superconducting and magnetic states induced by spin-orbit coupling, long-range triplet correlations in ferromagnets, electromagnetic proximity effect and the Fulde—Ferrell—Larkin—Ovchinnikov (FFLO) instability with the in-plane modulation vector in layered S/F structures. The review includes the description of the current experimental situation in the field as well as the description of perspective concepts and problems, which are important for the future development of superconducting spintronics.
Keywords: proximity effect, electromagnetic response, singlet and triplet superconducting correlations, hybrid superconductor - ferromagnet structures, spin-orbit coupling PACS:85.25.−j, 74.78.−w, 74.20.−z (all) DOI:10.3367/UFNe.2021.07.039020 Citation: Mel’nikov A S, Mironov S V, Samokhvalov A V, Buzdin A I "Superconducting spintronics: state of the art and perspectives" Phys. Usp., accepted
Received: 4th, June 2021, revised: 7th, July 2021, accepted: 12th, July 2021