2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29594Spin dependent single electron tunneling in a ferromagnetic double junction is investigated theoretically in the limit of incoherent sequential tunneling. The junction consists of a small nonmagnetic metallic grain with discrete energy levels, which is connected to two ferromagnetic electrodes. We have developed a new theoretical model taking into account charge as well as spin degrees of freedom. The model allows us to investigate new phenomena such as spin accumulation and spin fluctuations.4 page LaTeX (annalen.cls included), 2 eps-figures included.Has been presented at the international conference LOCALISATION 1999 - Disorder and Interaction in Transport Phenomena, Hamburg, Germany, 30. July - 2. August, 1999. To appear in Annalen der PhysikMesoscale and Nanoscale PhysicsMaterials Sciencetext