Abstract
Temperature-induced transition of thin superconductor/ferromagnet/normal-metal (S/F/N) hybrid structure to an in-plane Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is accompanied by vanishing of effective inverse magnetic field penetration depth ${\mathrm{\ensuremath{\Lambda}}}^{\ensuremath{-}1}$ [S. V. Mironov et al., Phys. Rev. Lett. 121, 077002 (2018)]. Here we show that ${\mathrm{\ensuremath{\Lambda}}}^{\ensuremath{-}1}$ goes to zero only in the limit of zero magnetic field $H\ensuremath{\rightarrow}0$ and at any finite parallel $H$ or in-plane current $I$ it is finite and positive in the FFLO state, which implies a diamagnetic response. We demonstrate that ${\mathrm{\ensuremath{\Lambda}}}^{\ensuremath{-}1}$ has a nonmonotonic dependence on $H$ and $I$ not only in the parameter range corresponding to the FFLO phase domain but also in its vicinity. We find that for S/F/N/F/S structures with certain thicknesses of F layers there is a temperature-, current-, and magnetic-field-driven transition to and out of the FFLO phase with a simultaneous jump of ${\mathrm{\ensuremath{\Lambda}}}^{\ensuremath{-}1}$.
Published Version
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