Magnetic aftereffects in CoFeB/Ta/CoFeB spin valves of large area

Abstract : Magnetic aftereffect measurements on a synthetic antiferromagnet with strong perpendicular anisotropy are presented. Two types of magnetic transitions are observed in the CoFeB/Ta/CoFeB bilayer where the two ferromagnetic CoFeB layers are antiferromagnetically coupled: the transition from a parallel to an antiparallel CoFeB layers magnetization alignment and the transition between two possible antiparallel magnetization states. Magnetic relaxation measurements show a complete reversal in the case of the transition between the two antiferromagnetic configurations. The experimental data can be well fitted in the frame of extended exponential relaxation using the Fatuzzo-Labrune model. Consequently, the domain nucleation and domain-wall propagation can be studied as a function of temperature and applied field.
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R. Morgunov, Y. Lu, M. Lavanant, T. Fache, X. Deveaux, et al.. Magnetic aftereffects in CoFeB/Ta/CoFeB spin valves of large area. Physical Review B : Condensed matter and materials physics, American Physical Society, 2017, 96 (5), ⟨10.1103/physrevb.96.054421⟩. ⟨hal-02011666⟩

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