2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151641It is shown that the current-perpendicular-to-plane giant magneto-resistance (CPP-GMR) oscillations, in the ballistic regime, are strongly correlated with those of the exchange coupling (J). Both the GMR and J are treated on equal footing within a rigorously solvable tight-binding single-band model. The strong correlation consists in sharing asymptotically the same period, determined by the spacer Fermi surface, and oscillating with varying spacer thickness predominantly in opposite phases.13 Pages, RevTex, 5 Figures includedMesoscale and Nanoscale PhysicsMaterials Sciencetext