Experiments revealed that transient electric field intensities up to 2.5 V / cm were generated during the initial period of combustion synthesis of the ferromagnetic products before the maximum temperature was reached. This occurred when the iron particles were partially oxidized and the reaction product was mainly magnetite ͑Fe 3 O 4 ͒. The electromagnetic field caused spontaneous magnetization of the product in the postcombustion zone. Magnetic field values up to 4 µT formed after the sample

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... emperature fell below the Curie temperature and the initial reactants were completely converted to the ferromagnetic phase PbFe 12 O 19 . Increasing the volume of the samples increases the absolute residual magnetic field magnitude after cooling. We present possible mechanisms of the electromagnetic field generation during the combustion.