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

Cubukcu M, Venkateshvaran D, Wittmann A, Wang SJ, Di Pietro R, Auffret S, Vila L, Wunderlich J, Sirringhaus H (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Applied Physics Letters American Institute of Physics (AIP)

Book Volume: 112

Article Number: 262409

Journal Issue: 26

DOI: 10.1063/1.5040321

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.

Involved external institutions

University of Cambridge

United Kingdom (GB) French Alternative Energies and Atomic Energy Commission (CEA)

France (FR)

How to cite

APA:

Cubukcu, M., Venkateshvaran, D., Wittmann, A., Wang, S.-J., Di Pietro, R., Auffret, S.,... Sirringhaus, H. (2018). Electrical nucleation and detection of single 360° homochiral Néel domain walls measured using the anomalous Nernst effect. Applied Physics Letters, 112(26). https://dx.doi.org/10.1063/1.5040321

MLA:

Cubukcu, Murat, et al. "Electrical nucleation and detection of single 360° homochiral Néel domain walls measured using the anomalous Nernst effect." Applied Physics Letters 112.26 (2018).

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