Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co2MnGa thin films

Abstract

We report a robust anomalous Nernst effect in Co2MnGa thin films in the thickness regime between 20 and 50 nm. The anomalous Nernst coefficient varied in the range of -2.0 to -3.0 uV/K at 300 K. We demonstrate that the anomalous Hall and Nernst coefficients exhibit similar behavior and fulfill the Mott relation. We simultaneously measure all four transport coefficients of the longitudinal resistivity, transversal resistivity, Seebeck coefficient, and anomalous Nernst coefficient. We connect the values of the measured and calculated Nernst conductivity by using the remaining three magneto-thermal transport coefficients, where the Mott relation is still valid. The intrinsic Berry curvature dominates the transport due to the relation between the longitudinal and transversal transport. Therefore, we conclude that the Mott relationship is applicable to describe the magneto-thermoelectric transport in Weyl semimetal Co2MnGa as a function of film thickness.

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• Creation of flexible spin-caloritronic material with giant transverse thermoelectric conversion by nanostructure engineering
• What's knot to like? Observation of a linked loop quantum state
• Giant intrinsic anomalous terahertz Faraday rotation in the magnetic Weyl semimetal Co${}_2$MnGa at room temperature
• Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co${}_2$MnGa and Co${}_2$MnAl
• Phenomenological analysis of transverse thermoelectric generation and cooling performance in magnetic/thermoelectric hybrid systems
• Anomalous Ettingshausen effect in iron-carbon alloys
• Anomalous Nernst effect in Mn${}_3$NiN thin films
• Role of chemical disorder in tuning the Weyl points in vanadium doped Co${}_2$TiSn
• Anisotropic magneto-thermal transport in Co${}_2$MnGa thin films
• Disorder- and Topology-Enhanced Fully Spin-Polarized Currents in Nodal Chain Spin-Gapless Semimetals
• High-resolution magnetic imaging by mapping the locally induced anomalous Nernst effect using atomic force microscopy
• Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets
• Co${}_2$MnZ (Z = Al, Si, Ga, Ge, Sn) Heusler alloys as candidate materials for spintronic and microelectronic applications: Electronic structure, transport, and magnetism
• Cooperative Nernst Effect of Multilayer Systems: Parallel Circuit Model Study
• Intrinsic Berry Curvature Driven Anomalous Hall and Nernst Effect in Co${}_2$MnSn
• Anomalous Nernst effect in Co thin films under laser irradiation
• Investigating the intrinsic anomalous Hall effect in MnPt3 topological semimetal
• Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe${}_3$Ga${}_4$ films