Identifying the octupole antiferromagnetic domain orientation in Mn.sub.3./sub.NiN by scanning anomalous Nernst effect microscopy

0558345 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR(CZ) GX19-28375X
GRANT EU: European Commission(XE) 766566 - ASPIN
Výzkumná infrastruktura: CzechNanoLab - 90110
Institucionální podpora: RVO:68378271
Klíčová slova: Mn₃NiN material * anomalous Nernst effect * non-collinear antiferromagnet * antiperovskite material
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4, rok: 2022
Způsob publikování: 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.
Trvalý link: http://hdl.handle.net/11104/0332073