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journal article·2023-10-01Open access

Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2

Teresa Tschirner, Philipp Keßler, Ruben Dario Gonzalez Betancourt, Tommy Kotte, Dominik Kriegner, Bernd Büchner, Joseph Dufouleur, Martin Kamp, Vedran Jovic, Libor Smejkal, Jairo Sinova, Ralph Claessen, Tomas Jungwirth, Simon Moser, Helena Reichlova, Louis Veyrat

APL Materials· Volume 11· Issue 10
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Source abstract

Abstract

Observations of the anomalous Hall effect in RuO2 and MnTe have demonstrated unconventional time-reversal symmetry breaking in the electronic structure of a recently identified new class of compensated collinear magnets, dubbed altermagnets. While in MnTe, the unconventional anomalous Hall signal accompanied by a vanishing magnetization is observable at remanence, the anomalous Hall effect in RuO2 is excluded by symmetry for the Néel vector pointing along the zero-field [001] easy-axis. Guided by a symmetry analysis and ab initio calculations, a field-induced reorientation of the Néel vector from the easy-axis toward the [110] hard-axis was used to demonstrate the anomalous Hall signal in this altermagnet. We confirm the existence of an anomalous Hall effect in our RuO2 thin-film samples, whose set of magnetic and magneto-transport characteristics is consistent with the earlier report. By performing our measurements at extreme magnetic fields up to 68 T, we reach saturation of the anomalous Hall signal at a field Hc ≃ 55 T that was inaccessible in earlier studies but is consistent with the expected Néel-vector reorientation field.
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Research context

OpenAlex topics: Magnetic properties of thin films · Advanced Condensed Matter Physics · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Leibniz Institute for Solid State and Materials Research, IFW Dresden 1 , Helmholtzstr. 20, 01069 Dresden, Germany

Würzburg-Dresden Cluster of Excellence ct.qmat 2 , Dresden, Germany

Physikalisches Institut, Universität Würzburg 3 , D-97074 Würzburg, Germany

Institute of Physics ASCR, v.v.i. 4 , Cukrovarnická 10, 162 53 Prague, Czech Republic

Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf 5 , 01328 Dresden, Germany

Institut für Festkörper- und Materialphysik, Technische Universität Dresden 6 , 01069 Dresden, Germany

Physikalisches Institut, Universität Würzburg 7 , D-97074 Würzburg, Germany and , D-97074 Würzburg, Germany

Röntgen Center for Complex Material Systems, Universität Würzburg 7 , D-97074 Würzburg, Germany and , D-97074 Würzburg, Germany

Earth Resources and Materials, Institute of Geological and Nuclear Science 8 , Lower Hutt 5010, New Zealand and , Wellington 6012, New Zealand

MacDiarmid Institute for Advanced Materials and Nanotechnology 8 , Lower Hutt 5010, New Zealand and , Wellington 6012, New Zealand

Institut für Physik, Johannes Gutenberg Universität Mainz 9 , 55128 Mainz, Germany

School of Physics and Astronomy, University of Nottingham 10 , NG7 2RD Nottingham, United Kingdom

Funding

Deutsche Forschungsgemeinschaft

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