Nonlinear transport properties of La2/3Ca1/3MnO3 and Fe3O4 films in the extreme Joule heating regime

J. Appl. Phys. 101, 103902 (2007)

Y. F. Chen and M. Ziese


The influence of the base temperature, magnetic field, current, and current sweep rate on the nonlinear transport properties of La2/3Ca1/3MnO3 and Fe3O4 films were studied in the regime of strong Joule heating. In resistance-current curves of the La2/3Ca1/3MnO3film an abrupt hysteretic transition was observed that was induced by global and reversible heating of the film, as could be shown by a direct measurement of the film temperature. In contrast to this behavior, in the case of the Fe3O4 film, only a gradual change of the voltage-current curves was detected, although also in this case Joule heating is present. Simulations of the resistance-current and temperature-current curves were carried out for the La2/3Ca1/3MnO3 film based on a model of global Joule heating. The simulation results were in good agreement with the experimental data.