Creep and Flow Regimes of Magnetic Domain-Wall Motion in Ultrathin Pt / Co / Pt Films with Perpendicular Anisotropy

P. J. Metaxas (1) , J. P. Jamet (1) , A. Mougin (1) , M. Cormier (1) , J. Ferré (1) , Vincent Baltz (2) , B. Rodmacq (2) , B. Dieny (2) , R. L. Stamps (3)

1 LPS - Laboratoire de Physique des Solides
2 SPINTEC - SPINtronique et TEchnologie des Composants
3 UWA - The University of Western Australia

We report on magnetic domain-wall velocity measurements in ultrathin Pt=Co0:5-0:8 nm†=Pt films with perpendicular anisotropy over a large range of applied magnetic fields. The complete velocity-field characteristics are obtained, enabling an examination of the transition between thermally activated creep and viscous flow: motion regimes predicted from general theories for driven elastic interfaces in weakly disordered media. The dissipation limited flow regime is found to be consistent with precessional domain-wall motion, analysis of which yields values for the damping parameter, .

Domaines: Matière Condensée [cond-mat]

P. J. Metaxas, J. P. Jamet, A. Mougin, M. Cormier, J. Ferré, et al.. Creep and Flow Regimes of Magnetic Domain-Wall Motion in Ultrathin Pt / Co / Pt Films with Perpendicular Anisotropy. Physical Review Letters, 2007, 99, pp.217208. ⟨10.1103/PhysRevLett.99.217208⟩. ⟨hal-01683825⟩