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Superconductivity (S) and ferromagnetism (F) are probed through transport andmagnetization measurements in nanometer scale HoNi$_5$-NbN (F-S) bilayers andHoNi$_5$-NbN-HoNi$_5$ (F-S-F) trilayers. The choice of materials has been madeon the basis of their comparable ordering temperatures and strong magneticanisotropy in HoNi$_5$. We observe the normal state reentrant behavior inresistance vs. temperature plots of the F-S-F structures just below thesuperconducting transition in the limited range of HoNi$_5$ layer thicknessd$_{HN}$ (20 nm $<$ d$_{HN}$ $<$ 80 nm) when d$_{NbN}$ is fixed at $\simeq$ 10nm. The reentrance is quenched by increasing the out-of-plane (H$_{\perp}$)magnetic field and transport current where as in-plane (H$_{\parallel}$) fieldof $\leq$ 1500 Oe has no effect on the reentrance. The thermally activated fluxflow characteristics of the S, F-S and F-S-F layers reveal a transition fromcollective pinning to single vortex pinning as we place F layers on both sidesof the S film. The origin of the reentrant behavior seen here in the range of0.74 $\leq$ T$_{Curie}$/T$_C$ $\leq$ 0.92 is attribute to a delicate balancebetween the magnetic exchange energy and the condensation energy in theinterfacial regions of the trilayer.

Interface driven reentrant superconductivity in HoNi$_5$-NbN-HoNi$_5$ nanostructures