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.
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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 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: | https://discovery.ucl.ac.uk/id/eprint/10064409 |
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