Field dependence of magnetization reversal by spin transfer

摘要: We describe and analyze the effect of an applied field ${(H}_{\mathrm{appl}})$ on current-driven magnetization reversal in pillar-shaped Co/Cu/Co trilayers. Depending magnitude ${H}_{\mathrm{appl}},$ we observe two different types transitions between parallel (P) antiparallel (AP) magnetic configurations Co layers. If ${H}_{\mathrm{appl}}$ is smaller than some threshold value, P AP are relatively sharp irreversible. For exceeding this progressive reversible. show that behavior can be precisely accounted for by introducing current-induced torque spin transfer models into a Landau-Lifshitz-Gilbert equation to determine stability or instability states. This analysis also provides good description dependence critical currents.