Current-induced effects in materials for which the first-order magnetic phase transition is accompanied by a strong change in electric resistivity are theoretically analyzed. An approach is developed that describes the magnetization and conductivity of thin film systems based on such material, for the temperature interval where two magnetic phases coexist. The changes in magnetic state and system temperature, originating from the Joule heating, are analyzed for the steady-state condition of the heat exchange with the surrounding medium. A way to achieve the temperature stabilization effect in the system is suggested. The possibility of tuning the system temperature by changing the external magnetic field is demonstrated.

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