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

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

doi:10.1209/0295-5075/113/67001

All issues

Volume 113 / No 6 (March 2016)

EPL, 113 6 (2016) 67001

Abstract

Issue		EPL Volume 113, Number 6, March 2016


Article Number		67001
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/113/67001
Published online		07 April 2016

EPL, 113 (2016) 67001

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

Thai Ha Pham¹^,2, J. Vogel¹^,2, J. Sampaio³, M. Vaňatka¹^,2, J.-C. Rojas-Sánchez¹^,2, M. Bonfim⁴, D. S. Chaves¹^,2, F. Choueikani⁵, P. Ohresser⁵, E. Otero⁵, A. Thiaville³ and S. Pizzini¹^,2

¹ CNRS, Institut Néel - 38042 Grenoble, France
² Univ. Grenoble Alpes, Institut Néel - 38042 Grenoble, France
³ Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay - 91405 Orsay, France
⁴ Departamento de Engenharia Elétrica, Universidade Federal do Paraná - Curitiba, Brazil
⁵ Synchrotron Soleil - L'Orme des Merisiers, Saint-Aubin, 91192 Gif- sur-Yvette, France

Received: 12 February 2016
Accepted: 30 March 2016

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. 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 $D/M_\mathrm{s}$ , where D is the strength of the DMI and $M_\mathrm{s}$ 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.

PACS: 75.70.Ak – Magnetic properties of monolayers and thin films / 75.60.Ch – Domain walls and domain structure

© EPLA, 2016

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