Competitive 0 and &pi; states in S/F/S trilayers: multimode approach

Karabassov T.; Stolyarov V.; Golubov Alexander; Silkin V.; Bayazitov Vadim; L'vov Boris; Vasenko A.

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KARABASSOV, T., STOLYAROV, V., GOLUBOV, Alexander, SILKIN, V., BAYAZITOV, Vadim, L'VOV, Boris, VASENKO, A.. Competitive 0 and π states in S/F/S trilayers: multimode approach. In: NANO: - 2019: Limits of Nanoscience and Nanotechnologies, Ed. 2019, 24-27 septembrie 2019, Chişinău. Chișinău, Republica Moldova: 2019, p. 32.

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NANO 2019

Conferința "SPINTECH Summer school “S/F Hybrid Structures for Spintronics”"
2019, Chişinău, Moldova, 24-27 septembrie 2019

Competitive 0 and π states in S/F/S trilayers: multimode approach

Pag. 32-32

Karabassov T.¹, Stolyarov V.², Golubov Alexander³, Silkin V.⁴, Bayazitov Vadim⁵, L'vov Boris⁶, Vasenko A.¹

¹ National Research University Higher School of Economics, Moscow,
² Moscow Institute of Physics and Technology,
³ University of Twente, Netherlands,
⁴ Donostia International Physics Center,
⁵ Kurnakov Institute of General and Inorganic Chemistry of the RAS, Moscow ,
⁶ National Research University Higher School of Economics, Saint-Petersburg

Disponibil în IBN: 23 ianuarie 2020

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We investigate the behavior of the critical temperature Tc in superconductor/ ferromagnet / superconductor (S/F/S) trilayers in the dirty limit as a function of the ferromagnetic layer thickness df and the S/F interface transparency. This system is interesting due to the possibility of realization of competitive 0 and π states. We perform Tc calculations using the general self-consistent multimode approach based on the Usadel equations in Matsubara Green’s functions technique, and compare the results with the single-mode approximation, widely used in the literature. Both methods produce similar results for sufficiently low interface transparency. For transparent interfaces we obtain a qualitatively different Tc(df) behavior [1]. Using the multimode approach we observe multiple 0- π transitions in critical temperature, which cannot be resolved by the single-mode approximation. We also calculate the critical S layer thickness at given df when an S/F/S trilayer still has a nonzero critical temperature. Finally, we establish the limits of applicability of the single-mode approximation.

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