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We show that a ferromagnetic (F) slab with the in-plane magnetizationsandwiched between two superconducting (S) films experiences strongdemagnetization effect due to the Meissner screening of the stray magneticfield by the superconductors. In the extreme case the transition of the S filmsfrom normal to the superconducting state can switch the demagnetization factorfrom 0 to 1 which is in a sharp contrast with the S/F bilayers where suchtransition affects the magnetic field inside the F film only slightly. Thegiant demagnetization effect is shown to be qualitatively robust against thedecreasing of the superconducting film thickness and may provide a hint towardsthe explanation of the anomalously large ferromagnetic resonance frequencyshift recently observed for the S/F/S structures [I. A. Golovchanskiy, N. N.Abramov, V. S. Stolyarov, V. I. Chichkov, M. Silaev, I. V. Shchetinin, A. A.Golubov, V. V. Ryazanov, A. V. Ustinov, and M. Yu. Kuprianov, Phys. Rev. Appl.14, 024086 (2020)].

Giant demagnetization effects induced by superconducting films