Magnetoelectric effects in superconductor/ferromagnet bilayers

D. S. Rabinovich, I. V. Bobkova, A. M. Bobkov, and M. A. Silaev
Phys. Rev. B 99, 214501 – Published 6 June 2019

Abstract

We demonstrate that the hybrid structures consisting of a superconducting layer with an adjacent spin-textured ferromagnet demonstrate the variety of equilibrium magnetoelectric effects originating from coupling between the conduction electron spin and superconducting current. By deriving and solving the generalized Usadel equation, which takes into account the spin-filtering effect, we find that a supercurrent generates spin polarization in the superconducting film which is noncoplanar with the local ferromagnetic moment. The inverse magnetoelectric effect in such structures is shown to result in the spontaneous phase difference across the magnetic topological defects such as a domain wall and helical spin texture. The possibilities to obtain dissipationless spin torques and detect domain-wall motion through the superconducting phase difference are discussed.

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  • Received 3 December 2018
  • Revised 3 April 2019

DOI:https://doi.org/10.1103/PhysRevB.99.214501

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. S. Rabinovich1,2,3, I. V. Bobkova3,2, A. M. Bobkov3, and M. A. Silaev4

  • 1Skolkovo Institute of Science and Technology, Skolkovo 143026, Russia
  • 2Moscow Institute of Physics and Technology, Dolgoprudny, 141700 Russia
  • 3Institute of Solid State Physics, Chernogolovka, Moscow Reg., 142432 Russia
  • 4Department of Physics and Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Finland

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Issue

Vol. 99, Iss. 21 — 1 June 2019

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