High-throughput imaging measurements of thermoelectric figure of merit

Abstract

We demonstrate a method for the simultaneous determination of the thermoelectric figure of merit of multiple martials by means of the lock-in thermography (LIT) technique. This method is based on the thermal analyses of the transient temperature distribution induced by the Peltier effect and Joule heating, which enables high-throughput estimation of the thermal diffusivity, thermal conductivity, volumetric heat capacity, Seebeck or Peltier coefficient of the materials. The LIT-based approach has high reproducibility and reliability because it offers sensitive noncontact temperature measurements and does not require the installation of an external heater. By performing the same measurements and analyses with applying an external magnetic field, the magnetic field and/or magnetization dependences of the Seebeck or Peltier coefficient and thermal conductivity can be determined simultaneously. We demonstrate the validity of this method by using several ferromagnetic metals (Ni, Ni${}_{95}$Pt${}_5$, and Fe) and a nonmagnetic metal (Ti). The proposed method will be useful for materials research in thermoelectrics and spin caloritronics and for investigation of magneto-thermal and magneto-thermoelectric transport properties.

arXiv comment12 pages, 7 figures, 1 table

References in corpus (6)

• Spin Caloritronics
• Thermal imaging of spin Peltier effect
• 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
• High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique
• Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys

Cited by in corpus (1)

• Quantitative noncontact measurement of thermal Hall angle and transverse thermal conductivity by lock-in thermography