The exchange field introduces a momentum mismatch between the spin-up and spin-down electrons that form a singlet pair, and this results in a weak oscillatory dependence superimposed on the decrease of T C with increasing thickness of the F layer 2, 3, 4. The dependence of the critical temperature ( T C) of ferromagnet–superconductor (F–S) bilayers has its origin in the spatially oscillating components of the wave function of the singlet Cooper pairs induced by the exchange field in the F layers 1.
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