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

Abstract

Observations of the anomalous Hall effect in RuO${}_2$ 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 RuO${}_2$ 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 towards 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 RuO${}_2$ 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 $H_{\mathrm{c}}\simeq$ 55 T that was inaccessible in earlier studies, but is consistent with the expected Néel-vector reorientation field.

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References in corpus (4)

• Observation of spin splitting torque in a collinear antiferromagnet RuO2
• Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Observation of spin-splitter torque in collinear antiferromagnetic RuO${}_2$

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