2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99413Within the microscopic Bogoliubov--de Gennes (BdG) formalism an exact quantization condition for Andreev bound states of the ferromagnetic-superconducting hybrid systems of box geometry is derived and a semi-classical formula for the density of states is obtained. The semi-classical formula is shown to agree with the exact result, even when the exchange field $h$, is much larger than the superconductor order parameter, provided $h$ is small compared with the Fermi energy.4 pages, 6 figuresMesoscale and Nanoscale PhysicsSuperconductivitytext