Volume 113, Number 6, March 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 April 2016|
Very large domain wall velocities in Pt/Co/GdOx and Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction
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
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 , where D is the strength of the DMI and 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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