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Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs

Janda, T.; Godinho, J.; Ostatnicky, T.; Pfitzner, E.; Ulrich, G.; Hoehl, A.; Reimers, S.; �ob�?, Z.; Metzger, T.; Reichlov�, H.; Nov�k, V.; Campion, R. P.; Heberle, J.; Wadley, P.; Edmonds, K. W.; Amin, O. J.; Chauhan, J. S.; Dhesi, S. S.; Maccherozzi, F.; Otxoa, R. M.; Roy, P. E.; Olejn�k, K.; N?mec, P.; Jungwirth, T.; Kaestner, B.; Wunderlich, J.

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Authors

T. Janda

J. Godinho

T. Ostatnicky

E. Pfitzner

G. Ulrich

A. Hoehl

S. Reimers

Z. �ob�?

T. Metzger

H. Reichlov�

V. Nov�k

J. Heberle

PETER WADLEY PETER.WADLEY@NOTTINGHAM.AC.UK
Professor of Physics

KEVIN EDMONDS kevin.edmonds@nottingham.ac.uk
Associate Professor & Reader in Physics

O. J. Amin

J. S. Chauhan

S. S. Dhesi

F. Maccherozzi

R. M. Otxoa

P. E. Roy

K. Olejn�k

P. N?mec

TOMAS JUNGWIRTH tomas.jungwirth@nottingham.ac.uk
Research Professor of Ferromagnetic Semiconductors

B. Kaestner

J. Wunderlich



Abstract

Antiferromagnets offer spintronic device characteristics unparalleled in ferromagnets owing to their lack of stray fields, THz spin dynamics, and rich materials landscape. Microscopic imaging of antiferromagnetic domains is one of the key prerequisites for understanding physical principles of the device operation. However, adapting common magnetometry techniques to the dipolar-field-free antiferromagnets has been a major challenge. Here we demonstrate in a collinear antiferromagnet a thermoelectric detection method by combining the magneto-Seebeck effect with local heat gradients generated by scanning far-field or near-field techniques. In a 20-nm epilayer of uniaxial CuMnAs we observe reversible 180∘ switching of the Néel vector via domain wall displacement, controlled by the polarity of the current pulses. We also image polarity-dependent 90∘ switching of the Néel vector in a thicker biaxial film, and domain shattering induced at higher pulse amplitudes. The antiferromagnetic domain maps obtained by our laboratory technique are compared to measurements by the established synchrotron-based technique of x-ray photoemission electron microscopy using x-ray magnetic linear dichroism.

Citation

Janda, T., Godinho, J., Ostatnicky, T., Pfitzner, E., Ulrich, G., Hoehl, A., …Wunderlich, J. (2020). Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs. Physical Review Materials, 4(9), Article 094413. https://doi.org/10.1103/physrevmaterials.4.094413

Journal Article Type Article
Acceptance Date Aug 12, 2020
Online Publication Date Sep 28, 2020
Publication Date Sep 28, 2020
Deposit Date Nov 9, 2020
Publicly Available Date Nov 9, 2020
Journal Physical Review Materials
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 4
Issue 9
Article Number 094413
DOI https://doi.org/10.1103/physrevmaterials.4.094413
Public URL https://nottingham-repository.worktribe.com/output/5030600
Publisher URL https://journals.aps.org/prmaterials/abstract/10.1103/PhysRevMaterials.4.094413

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