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Article Dans Une Revue EPL - Europhysics Letters Année : 2016

Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction

J. Vogel
J. Sampaio
J.-C. Rojas-Sanchez
F. Choueikani
  • Fonction : Auteur
P. Ohresser
  • Fonction : Auteur
E. Otero
  • Fonction : Auteur
Thai Ha Pham
  • Fonction : Auteur
J.-C. Rojas-Sánchez

Résumé

We carried out measurements of domain wall (DW) velocities driven by magnetic field pulses in symmetric Pt/Co/Pt and asymmetric Pt/Co/AlOx, Pt/Co/GdOx and Pt/Co/Gd trilayers with ultrathin Co layers and perpendicular magnetic anisotropy. In agreement with theoretical models, the maximum observed velocity is much larger in the asymmetric samples, where the interfacial Dzyaloshinskii-Moriya interaction (DMI) stabilises chiral N\'eel walls, than in the symmetric stack. In addition, in Pt/Co/Gd very large DW speeds (up to 600 m/s) are obtained, 2.5 times larger than in samples with oxidised Gd. Magnetic measurements reveal that this may be explained by the anti-parallel coupling between the magnetic moments of Gd and Co at the Gd/Co interface, leading to a decrease of the total magnetisation. In quantitative agreement with analytical models, in all samples the maximum observed DW speed scales as D/Ms, where D is the strength of the DMI and Ms the spontaneous magnetisation.

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Dates et versions

hal-01275326 , version 1 (12-04-2018)

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Citer

Thai Ha Pham, J. Vogel, J. Sampaio, M. Vaňatka, J.-C. Rojas-Sanchez, et al.. Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction. EPL - Europhysics Letters, 2016, 113 (6), pp.67001. ⟨10.1209/0295-5075/113/67001⟩. ⟨hal-01275326⟩
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