Comparing the anomalous Hall effect and the magneto-optical Kerr effect through antiferromagnetic phase transitions in Mn${}_3$Sn

Abstract

In the non-collinear antiferromagnet Mn${}_3$Sn, we compare simultaneous measurements of the anomalous Hall effect (AHE) and the magneto-optical Kerr effect (MOKE) through two magnetic phase transitions: the high-temperature paramagnetic/antiferromagnetic phase transition at the Néel temperature ($T_N\approx$420~K), and a lower-temperature incommensurate magnetic ordering at $T_1\approx$270~K. While both the AHE and MOKE are sensitive to the same underlying symmetries of the antiferromagnetic non-collinear spin order, we find that the transition temperatures measured by these two techniques unexpectedly differ by approximately 10~K. Moreover, the applied magnetic field at which the antiferromagnetic order reverses is significantly larger when measured by MOKE than when measured by AHE. These results point to a difference between the bulk and surface magnetic properties of Mn${}_3$Sn.

arXiv comment5 pages, 3 figures; published in APL

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• Spin-Polarized Antiferromagnetic Spintronics
• Time-dependent multistate switching of topological antiferromagnetic order in Mn${}_3$Sn
• Giant effective damping of octupole oscillation in an antiferromagnetic Weyl semimetal
• Classification of second harmonic generation effect in magnetically ordered materials
• Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets
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• Second-order topological magneto-optical effects in noncoplanar antiferromagnets
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• Topological magneto-optics in the non-coplanar antiferromagnet Co_{1/3}NbS_2: Imaging and writing chiral magnetic domains
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
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