Abstract
We have used torque magnetometry to investigate the influence of magnetic spacer layers on the superconductivity in Nb/Co multilayers. Compared to similar systems which have nonmagnetic spacer layers, the samples exhibit two dimensional superconductivity for relatively thin magnetic layer thicknesses ${d}_{\mathrm{Co}},$ reflecting the effects of magnetic pair breaking. Moreover, the transition temperature to the superconducting state ${T}_{c}$ shows a nonmonatonic dependence on ${d}_{\mathrm{Co}},$ which we examine within the framework of recent theories.
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