Imperial College London
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Professor Lesley F Cohen

Faculty of Natural Sciences, Department of Physics

Associate Provost (Equality, Diversity and Inclusion)
 
 
 
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Contact

 

+44 (0)20 7594 7598l.cohen Website CV

 
 
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Assistant

 

Mrs Carolyn Dale +44 (0)20 7594 7579

 
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Location

 

1111Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Johnson:2022:10.1063/5.0091257,
author = {Johnson, F and Kimak, J and Zemen, J and Soban, Z and Schmoranzerova, E and Godinho, J and Nemec, P and Beckert, S and Reichlova, H and Boldrin, D and Wunderlich, J and Cohen, LF},
doi = {10.1063/5.0091257},
journal = {Applied Physics Letters},
pages = {1--6},
title = {Identifying the octupole antiferromagnetic domain orientation in Mn3NiN by scanning anomalous Nernst effect microscopy},
url = {http://dx.doi.org/10.1063/5.0091257},
volume = {120},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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. The sign of each component of the anomalous Nernst effect is determined by the local antiferromagnetic domain state. 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. These images together with atomistic and micromagnetic simulations suggest an average macrodomain of the order of 1 μm2.
AU  - Johnson,F
AU  - Kimak,J
AU  - Zemen,J
AU  - Soban,Z
AU  - Schmoranzerova,E
AU  - Godinho,J
AU  - Nemec,P
AU  - Beckert,S
AU  - Reichlova,H
AU  - Boldrin,D
AU  - Wunderlich,J
AU  - Cohen,LF
DO  - 10.1063/5.0091257
EP  - 6
PY  - 2022///
SN  - 0003-6951
SP  - 1
TI  - Identifying the octupole antiferromagnetic domain orientation in Mn3NiN by scanning anomalous Nernst effect microscopy
T2  - Applied Physics Letters
UR  - http://dx.doi.org/10.1063/5.0091257
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000808014700005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://pubs.aip.org/aip/apl/article/120/23/232402/2833797/Identifying-the-octupole-antiferromagnetic-domain
UR  - http://hdl.handle.net/10044/1/97627
VL  - 120
ER  -
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