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Field dependence of magnetization reversal by spin transfer

J. Grollier·V. Cros·H. Jaffres·A. Hamzic·J. M. George·G. Faini·J. Ben Youssef·H. Legall·A. Fert
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Abstract

We analyse the effect of the applied field (Happl) on the current-driven magnetization reversal in pillar-shaped Co/Cu/Co trilayers, where we observe two different types of transition between the parallel (P) and antiparallel (AP) magnetic configurations of the Co layers. If Happl is weaker than a rather small threshold value, the transitions between P and AP are irreversible and relatively sharp. For Happl exceding the threshold value, the same transitions are progressive and reversible. We show that the criteria for the stability of the P and AP states and the experimentally observed behavior can be precisely accounted for by introducing the current-induced torque of the spin transfer models in a Landau-Lifschitz-Gilbert equation. This approach also provides a good description for the field dependence of the critical currents.

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J. Grollier, V. Cros, H. Jaffres, A. Hamzic, J. M. George, G. Faini, J. Ben Youssef, H. Legall, A. Fert. 2002-11-18. Field dependence of magnetization reversal by spin transfer. https://doi.org/10.1103/physrevb.67.174402

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