First-principles Study of Strain Engineering for Anomalous Nernst Effect in Iron-based Binary Ferromagnets
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The anomalous Nernst effect (ANE) generates transverse thermoelectric voltage in magnetic materials, offering advantages for device applications. We investigated L12-type Fe3Ga, which exhibits large ANE with transverse thermoelectric conductivity of ~3 AK⁻¹m⁻¹ at room temperature, comparable to leading ANE materials. Remarkably, tensile strain switches the sign of ANE, achieving a bipolar thermoelectric response through strain engineering. Electronic structure analysis reveals that strain loading tunes key topological features, demonstrating strain engineering as a promising approach for enhancing thermoelectric performance.
