Giant Anomalous Nernst Effect in Noncollinear Antiferromagnetic Mn-based Antiperovskite Nitrides

Abstract

The anomalous Nernst effect (ANE) - the generation of a transverse electric voltage by a longitudinal heat current in conducting ferromagnets or antiferromagnets - is an appealing approach for thermoelectric power generation in spin caloritronics. The ANE in antiferromagnets is particularly convenient for the fabrication of highly efficient and densely integrated thermopiles as lateral configurations of thermoelectric modules increase the coverage of heat source without suffering from the stray fields that are intrinsic to ferromagnets. In this work, using first-principles calculations together with a group theory analysis, we systematically investigate the spin order-dependent ANE in noncollinear antiferromagnetic Mn-based antiperovskite nitrides Mn${}_{3}X$N ($X$ = Ga, Zn, Ag, and Ni). The ANE in Mn${}_{3}X$N is forbidden by symmetry in the R1 phase but amounts to its maximum value in the R3 phase. Among all Mn${}_{3}X$N compounds, Mn${}_3$NiN presents the most significant anomalous Nernst conductivity of 1.80 AK${}^{-1}$m${}^{-1}$ at 200 K, which can be further enhanced if strain, electric, or magnetic fields are applied. The ANE in Mn${}_3$NiN, being one order of magnitude larger than that in the famous Mn${}_3$Sn, is the largest one discovered in antiferromagnets so far. The giant ANE in Mn${}_3$NiN originates from the sharp slope of the anomalous Hall conductivity at the Fermi energy, which can be understood well from the Mott relation. Our findings provide a novel host material for realizing antiferromagnetic spin caloritronics which promises exciting applications in energy conversion and information processing.

arXiv comment8 pages, 4 figures

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• Tunable magneto-optical effect, anomalous Hall effect and anomalous Nernst effect in two-dimensional room-temperature ferromagnet $1T$-CrTe${}_2$
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• Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3
• A mono-material Nernst thermopile with hermaphroditic legs
• Identifying the octupole Antiferromagnetic domain orientation in Mn${}_3$NiN by scanning Anomalous Nernst Effect microscopy
• Effect of N, C and B interstitials on the structural and magnetic properties of alloys with Cu${}_3$Au-structure
• Spin-chirality-driven second-harmonic generation in two-dimensional magnet CrSBr
• Anomalous Nernst effect in Mn${}_3$NiN thin films
• Ab initio calculation of the magnetic Gibbs free energy of materials using magnetically constrained supercells
• Tunable anomalous Hall and Nernst effects in MM'X compounds
• Intrinsic and extrinsic anomalous transport properties of Heusler ferromagnets Fe${}_2$CoAl and Fe${}_2$NiAl from first principles
• Intrinsic and extrinsic anomalous transport properties in noncollinear antiferromagnetic Mn${}_3$Sn from first-principle calculations
• Large asymmetric anomalous Nernst effect in the antiferromagnet SrIr${}_{0.8}$Sn${}_{0.2}$O${}_3$
• Noncollinear antiferromagnetic textures driven high harmonic generation from magnetic dynamics in the absence of spin-orbit coupling
• Magnetic-Field and Strain Engineering of Modulated Transverse Transport in Altermagnetic Topological Materials
• Enhanced anomalous Nernst effects in ferromagnetic materials driven by Weyl nodes