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Article Dans Une Revue Physical Review B Année : 2016

Domain wall dynamics in ultrathin Pt/Co/AlOx microstrips under large combined magnetic fields

Emilie Jué
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André Thiaville
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Joao Sampaio
Stanislas Rohart
Jan Vogel
Olivier Boulle
Ioan Mihai Miron
Gilles Gaudin

Résumé

The dynamics of magnetic domain walls in ultrathin strip-patterned Pt/Co/AlOx samples with perpendicular easy axis has been studied experimentally under an easy-axis field, superposed to a hard-axis field oriented along the strip. The easy-axis field is large so that the domain walls move well beyond the creep regime. A chiral effect is observed where the domain wall velocity shows a monotonous and surprisingly large variation with an in-plane field. A micromagnetic analysis, combining analytic, one-dimensional, and two-dimensional simulations with structural disorder, shows that this behavior can be reproduced with a Dzyaloshinskii-Moriya interaction of the interfacial type, with due consideration of the dynamics of the tilt degree of freedom of the domain wall. The estimated effective value of this interaction (D≈−2.2mJ/m2 for a 0.6 nm Co thickness) is consistent with values obtained by other techniques. It is also shown, by micromagnetic analysis, that several modes and characteristic times occur in the dynamics of the tilt of such domain walls.

Dates et versions

hal-01251733 , version 1 (06-01-2016)

Identifiants

Citer

Emilie Jué, André Thiaville, Stefania Pizzini, Jacques Miltat, Joao Sampaio, et al.. Domain wall dynamics in ultrathin Pt/Co/AlOx microstrips under large combined magnetic fields. Physical Review B, 2016, 93 (1), pp.014403. ⟨10.1103/PhysRevB.93.014403⟩. ⟨hal-01251733⟩
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