Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect

Abstract

A transverse thermoelectric generator for magnetic-field-free and high-density power generation utilizing the anomalous Nernst effect is constructed and its performance is characterized. By alternately stacking two different permanent magnets with the large coercivity and anomalous Nernst coefficients of opposite sign, transverse thermoelectric voltage and power can be generated in the absence of external magnetic fields and enhanced owing to a thermopile structure without useless electrode layers. In the permanent-magnet-based stack, the magnetic attractive force enables easy construction of the thermopile structure with a high fill factor. In this study, we construct a bulk module consisting of twelve pairs of SmCo${}_5$- and Nd${}_2$Fe${}_{14}$B-type permanent magnets with respectively having the positive and negative anomalous Nernst coefficients, whose fill factor reaches ~80%, whereas that of conventional thermoelectric modules based on the Seebeck effect is typically 30-60%. We demonstrate magnetic-field-free anomalous Nernst power generation up to 177 $\mu$W at a temperature difference of 75 K around room temperature, which corresponds to the largest anomalous Nernst power density of 65 $\mu$W/cm${}^2$. The presented module structure concept will provide a design guideline for high-performance transverse thermoelectric power generation.

arXiv comment11 pages, 4 figures

References in corpus (14)

• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• Thermoelectric generation based on spin Seebeck effects
• Large anomalous Nernst effect in thin films of the Weyl semimetal Co2MnGa
• Transverse thermoelectric generation using magnetic materials
• Thermoelectrics: from Longitudinal to Transverse
• Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
• Visualization of Anomalous Ettingshausen Effect in a Ferromagnetic Film: Direct Evidence of Different Symmetry from Spin Peltier Effect
• Sm-Co-based amorphous alloy films for zero-field operation of transverse thermoelectric generation
• Scalable Nernst Thermoelectric Power using a Coiled Galfenol Wire
• High-temperature dependence of anomalous Ettingshausen effect in SmCo${}_5$-type permanent magnets
• Observation of spin Seebeck contribution to the transverse thermopower in Ni-Pt and MnBi-Au bulk nanocomposites
• Systematic Investigation of Anisotropic Magneto-Peltier Effect and Anomalous Ettingshausen Effect in Ni Thin Films
• High power density energy harvesting devices based on the anomalous Nernst effect of Co/Pt magnetic multilayers

Cited by in corpus (5)

• Hybridizing anomalous Nernst effect in artificially tilted multilayer based on magnetic topological material
• Fundamentals and advances in transverse thermoelectrics
• Multifunctional composite magnet realizing record-high transverse thermoelectric generation
• Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets
• Spin caloritronics: History and future prospects of experiments