Magnetic Skyrmions in Metallic Multilayers: FM and SAF Structures, Chirality and Electronic Transport Properties
CIC nanoGUNE Seminars
- Speaker
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Nicolas Reyren, Unité Mixte de Physique CNTS-Thales (France)
- When
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2019/11/26
12:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
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**Magnetic Skyrmions in Metallic Multilayers: FM and SAF Structures, Chirality
and Electronic Transport Properties**
A fundamental aspect of magnetic skyrmions is their chirality, which results
from the Dzyaloshinskii-Moriya interaction (DMI) at interfaces (for the
metallic multilayers that I will present). I will discuss about the
experimental methods allowing the determination of the chirality in
multilayers, and in particular the x-ray resonant magnetic scattering (XRMS)
[1]. These experiments indicate that, in some cases, the dipolar interaction
is stronger than the DMI, leading to 3D magnetization textures with hybrid
chirality [2]. The torques and forces exerted on a skyrmion being strongly
dependent upon its chirality, these textures must be carefully examined.
Producing synthetic antiferromagnetic (SAF) by coupling antiferromagnetically
adjacent ferromagnetic layers reduces the role of the dipolar interaction,
allowing skyrmions to be stable with smaller diameters. The SAF structure also
leads to a reduction or cancellation of the skyrmion Hall angle, which might
be detrimental in some applications. I will describe our progress about the
design of such SAF systems and the resulting observation of very small
skyrmions [3].
Finally, I will discuss about the electrical properties related to the
presence of magnetic skyrmions and other magnetic textures, starting by their
detection using anomalous Hall effect [4] and anomalous Nernst effect [5].
** 1. **J.-Y. Chauleau et al, Phys. Rev. Lett. 120, 037202 (2018)
** 2. **W. Legrand et al, Science Adv. 4, eaat0415 (2018)
** 3.** W. Legrand et al, Nat. Mater. DOI: 10.1038/s41563-019-0468-3
(2019)
** 4.** D. Maccariello et al, Nat. Nanotechnol. 13, 233 (2018)
** 5. **A. F. Scarioni et al, submitted to Nano Letters
**Host:** L. Hueso