Very large domain wall velocities in Pt/Co/GdOx and Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction
| Main Authors: | Ha Pham, Thai, Vogel, J., Sampaio, J., Vaňatka, M., Rojas-Sánchez, J.-C., Bonfim, M., Chaves, D. S., Choueikani, F., Ohresser, P., Otero, E., Thiaville, A., Pizzini, S. |
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| Format: | Article Journal |
| Terbitan: |
, 2016
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| Online Access: |
https://zenodo.org/record/1067814 |
Daftar Isi:
- 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. The maximum observed velocity is much larger in the asymmetric samples, where the interfacial Dzyaloshinskii-Moriya interaction (DMI) stabilises chiral Néel walls. 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. In Pt/Co/Gd, where the anti-parallel coupling between the magnetic moments of Gd and Co leads to a decrease of the total magnetisation, very large DW speeds (up to 700 m/s) are obtained.