Influence of the magnetic field sweeping rate on magnetic transitions in synthetic ferrimagnets with perpendicular anisotropy

R. B Morgunov (1, 2) , E I Kunitsyna (1, 2) , A. D Talantsev (1, 2, 3) , O. V Koplak (1, 2) , T. Fache (4) , Yuan Lu (4) , S. Mangin (4)

1 Institute of Problems of Chemical Physics of RAS
2 Tambov State Technical University, 392000 Tambov, Russia
3 Department of Emerging Materials Science, DGIST, Daegu 42988, South Korea
4 IJL - Institut Jean Lamour

The evolution of the switching field between stable states in MgO/CoFeB/Ta/CoFeB/MgO/GaAs and Pt/Co/Ir/Co/Pt/Ta/SiO2 synthetic ferrimagnets with perpendicular anisotropy as a function of the magnetic field sweeping rate (MFSR) 0.1-10 4 Oe/s has been studied. The most significant effect of the MFSR is an inversion of interstate transitions sequence. In the MgO/CoFeB/Ta/CoFeB/MgO/GaAs heterostructure, the increase of MFSR switches the dominant mechanism of magnetization reversal from propagation of domain walls to a nucleation of reversed magnetization areas. In Pt/Co/Ir/Co/Pt/Ta/ SiO2, the MFSR affects the final domain state of the transition, starting from the initial antiparallel configuration of the synthetic ferrimagnet.

Mots clés: synthetic antiferromagnets, magnetic heterostructures, domain walls, perpendicular anisotropy, microwave magnetoresistance, magnetic relaxation, Kerr microscopy

Domaines: Science des matériaux [cond-mat.mtrl-sci]

R. B Morgunov, E I Kunitsyna, A. D Talantsev, O. V Koplak, T. Fache, et al.. Influence of the magnetic field sweeping rate on magnetic transitions in synthetic ferrimagnets with perpendicular anisotropy. Applied Physics Letters, 2019, 114 (22), pp.222402. ⟨10.1063/1.5096951⟩. ⟨hal-02999627v2⟩