2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122555Detection of current-induced spin accumulation via ferromagnetic contacts is discussed. Onsager's relations forbid that in a two-probe configuration spins excited by currents in time-reversal symmetric systems can be detected by switching the magnetization of a ferromangetic detector contact. Nevertheless, current-induced spins can be transferred as a torque to a contact magnetization and affect the charge currents in many-terminal configurations. We demonstrate the general concepts by solving the microscopic transport equations for the diffuse Rashba system with magnetic contacts.Accpeted for publication in Physical Review Letters, 5 pages, 3 color figures, RevTeXMesoscale and Nanoscale Physicstext