Measurement of the Curie temperature based on temperature dependent thermal properties

Abstract

Abstract A temperature gradient evaluation method for swift determination of the Curie temperature TC based on thermal conductivity and thermal diffusivity as functions of temperature is presented. In an imposed one-dimensional temperature gradient, temperature profiles along the axis of a cylindrical sample are recorded in steady-state and transient states using a photon detector. Transient temperature profiles are evaluated by an inverse numerical method, yielding the temperature dependent thermal diffusivity with a distinct change in slope at TC. The slope of the steady-state temperature profile adjusts according to the local thermal conductivity and changes abruptly at TC. The high-resolution determination of the temperature dependent thermal properties allows the identification of TC by two independent evaluations during a single experimental run, solely relying on data of thermal conductivity and thermal diffusivity. The obtained TC excellently agrees with literature values gained by conventional methods.