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

被引：76
|
作者：
Thai Ha Pham [1 ,2 ]
Vogel, J. [1 ,2 ]
Sampaio, J. [3 ]
Vanatka, M. [1 ,2 ]
Rojas-Sanchez, J-C [1 ,2 ]
Bonfim, M. [4 ]
Chaves, D. S. [1 ,2 ]
Choueikani, F. [5 ]
Ohresser, P. [5 ]
Otero, E. [5 ]
Thiaville, A. [3 ]
Pizzini, S. [1 ,2 ]
机构：
[1] CNRS, Inst Neel, F-38042 Grenoble, France
[2] Univ Grenoble Alpes, Inst Neel, F-38042 Grenoble, France
[3] Univ Paris Saclay, Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France
[4] Univ Fed Parana, Dept Elect Engn, BR-80060000 Curitiba, Parana, Brazil
[5] Synchrotron Soleil LOrme Merisiers, F-91192 Gif Sur Yvette, France
来源：
EPL | 2016年 / 113卷 / 06期
关键词：
RAY CIRCULAR-DICHROISM; DYNAMICS;
D O I：
10.1209/0295-5075/113/67001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We carried out measurements of domain wall (DW) velocities driven by magneticfield 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 Neel 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 M-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 700m/s) are obtained. Copyright (C) EPLA, 2016
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页数：6
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