  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.
