2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/30097The proximity effect in mesoscopic ferromagnet/superconductor ($FS$) Ni/Al structures of various geometries was studied experimentally on both $F$- and $S$-sides of the structures. Samples with a wide range of interface transparency were fabricated. The dependence of the effect on $FS$ interface transparency was investigated. The amplitude of this effect was found to be larger than expected from classical theory of proximity effect. Preliminary experiments showed no phase-sensitive oscillations in Andreev interferometer geometry. Various theoretical models are discussed.10 pages, 6 figures, to appear in J. Low-Temp. PhysSuperconductivityMesoscale and Nanoscale Physicstext