Sm-Co-based amorphous alloy films for zero-field operation of transverse thermoelectric generation

Abstract

Transverse thermoelectric generation using magnetic materials is essential to develop active thermal engineering technologies, for which the improvements of not only the thermoelectric output but also applicability and versatility are required. In this study, using combinatorial material science and lock-in thermography technique, we have systematically investigated the transverse thermoelectric performance of Sm-Co-based alloy films. The high-throughput material investigation revealed the best Sm-Co-based alloys with the large anomalous Nernst effect (ANE) as well as the anomalous Ettingshausen effect (AEE). In addition to ANE/AEE, we discovered unique and superior material properties in these alloys: the amorphous structure, low thermal conductivity, and large in-plane coercivity and remanent magnetization. These properties make it advantageous over conventional materials to realize heat flux sensing applications based on ANE, as our Sm-Co-based films can generate thermoelectric output without an external magnetic field. Importantly, the amorphous nature enables the fabrication of these films on various substrates including flexible sheets, making the large-scale and low-cost manufacturing easier. Our demonstration will provide a pathway to develop flexible transverse thermoelectric devices for smart thermal management.

40 pages in total, 10 main figures, 1 graphical abstract, 3 supplementary figures

References in corpus (11)

• Mott Relation for Anomalous Hall and Nernst effects in Ga1-xMnxAs Ferromagnetic Semiconductors
• Thermal imaging of spin Peltier effect
• An electrochemical thermal transistor
• Transverse thermoelectric generation using magnetic materials
• Spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films
• Anomalous transverse response of Co${}_2$MnGa and universality of the room-temperature ${\alpha }_{ij}^A/{\sigma }_{ij}^A$ ratio across topological magnets
• Heat flux sensing by anomalous Nernst effect in Fe-Al thin films on a flexible substrate
• Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
• High-temperature dependence of anomalous Ettingshausen effect in SmCo${}_5$-type permanent magnets
• Spintronic thermal management
• Combinatorial tuning of electronic structure and thermoelectric properties in Co${}_2$MnAl${}_{1-x}$Si${}_x$ Weyl semimetals

Cited by in corpus (7)

• Creation of flexible spin-caloritronic material with giant transverse thermoelectric conversion by nanostructure engineering
• Fundamentals and advances in transverse thermoelectrics
• Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect
• Direct electrical probing of anomalous Nernst conductivity
• Non-equilibrium Magnon Engineering Enabling Significant Thermal Transport Modulation
• High-throughput development of flexible amorphous materials showing large anomalous Nernst effect via automatic annealing and thermoelectric imaging
• Designing flexible hard magnetic materials for zero-magnetic-field operation of the anomalous Nernst effect