UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Electrical nucleation and detection of single 360 degrees homochiral Neel domain walls measured using the anomalous Nernst effect

Cubukcu, M; Venkateshvaran, D; Wittmann, A; Wang, S-J; Di Pietro, R; Auffret, S; Vila, L; ... Sirringhaus, H; + view all (2018) Electrical nucleation and detection of single 360 degrees homochiral Neel domain walls measured using the anomalous Nernst effect. Applied Physics Letters , 112 (26) , Article 262409. 10.1063/1.5040321. Green open access

[img]
Preview
Text
1.5040321.pdf - ["content_typename_Published version" not defined]

Download (1MB) | Preview

Abstract

Using a thermoelectric measurement, we demonstrate the nucleation and detection of a single 360° homochiral Néel domain wall (DW), formed by an independently nucleated pair of 180° Néel DWs having the same helicity in a perpendicular magnetic anisotropy track. The DW formation is governed by strong interfacial Dzyaloshinskii-Moriya interaction (DMI) and detected at room temperature using the anomalous Nernst effect (ANE). A large DMI can be generated at an interface where the symmetry is broken between a material having a large spin-orbit coupling and a thin ferromagnetic layer. The ANE voltage, VANE∝∇T×M, is sensitive to the magnitude of the out-of-plane magnetization M through a confined in-plane temperature gradient ∇T and allows for the direct thermoelectrical detection of the DW position with nanoscale accuracy along the track. Here, we present evidence that independently nucleated pairs of 180° Néel DWs in microwire devices can be brought together by an applied magnetic field to form a 360° homochiral Néel DW. Subsequently, we show that a strong magnetic field needs to be applied in order to annihilate the 360° DW due to the strong interfacial DMI in our Pt/Co(0.6nm)/AlOx multilayers. In addition to enabling a high magnetic storage and data transfer rate with low power consumption in novel computational and storage devices, such DWs facilitate a reduction in bit size down to a few nanometers with metastability.

Type: Article
Title: Electrical nucleation and detection of single 360 degrees homochiral Neel domain walls measured using the anomalous Nernst effect
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.5040321
Publisher version: https://doi.org/10.1063/1.5040321
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10064409
Downloads since deposit
3Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item