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Identifying the octupole antiferromagnetic domain orientation in Mn.sub.3./sub.NiN by scanning anomalous Nernst effect microscopy
- 1.0558345 - FZÚ 2023 RIV US eng J - Journal Article
Johnson, F. - Kimák, J. - Zemen, J. - Šobáň, Zbyněk - Schmoranzerová, E. - Godinho, João - Němec, P. - Beckert, S. - Reichlová, Helena - Boldrin, D. - Wunderlich, J. - Cohen, L.F.
Identifying the octupole antiferromagnetic domain orientation in Mn3NiN by scanning anomalous Nernst effect microscopy.
Applied Physics Letters. Roč. 120, č. 23 (2022), č. článku 232402. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA ČR(CZ) GX19-28375X
EU Projects: European Commission(XE) 766566 - ASPIN
Research Infrastructure: CzechNanoLab - 90110
Institutional support: RVO:68378271
Keywords : Mn3NiN material * anomalous Nernst effect * non-collinear antiferromagnet * antiperovskite material
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4, year: 2022
Method of publishing: Open access
The intrinsic anomalous Nernst effect in a magnetic material is governed by the Berry curvature at the Fermi energy and can be realized in non-collinear antiferromagnets with vanishing magnetization. Thin films of (001)-oriented Mn3NiN have their chiral antiferromagnetic structure located in the (111) plane facilitating the anomalous Nernst effect unusually in two orthogonal in-plane directions. In this work, a temperature gradient is induced in a 50 nm thick Mn3NiN two micrometer-size Hall cross by a focused scanning laser beam, and the spatial distribution of the anomalous Nernst voltage is used to image and identify the octupole macrodomain arrangement. Although the focused laser beam width may span many individual domains, cooling from room temperature to the antiferromagnetic transition temperature in an in-plane magnetic field prepares the domain state, producing a checkerboard pattern resulting from the convolution of contributions from each domain.
Permanent Link: http://hdl.handle.net/11104/0332073
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