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arXiv · 1602.04144

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

Thai Ha Pham·J. Vogel·J. Sampaio·M. Vaňatka·J. -C. Rojas·M. Bonfim·D. S. Chaves·F. Choueikani·P. Ohresser·E. Otero·A. Thiaville·S. Pizzini
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Abstract

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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Thai Ha Pham, J. Vogel, J. Sampaio, M. Vaňatka, J. -C. Rojas, M. Bonfim, D. S. Chaves, F. Choueikani, P. Ohresser, E. Otero, A. Thiaville, S. Pizzini. 2016-02-12. Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction. https://doi.org/10.1209/0295-5075/113/67001

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