SQUID detection of magnetic fields produced by chemical reactions

We report on the detection of chemomagnetic fields produced by solid state combustion and liquid-solid reactions. Magnetic time series and noise spect ra are recorded with high-T-c SQUID magnetometers. The moving reaction zone , ion convection, ion diffusion all cause macroscopic ionic currents, which generate electric and magnetic fields, A simple electromagnetic model desc ribes the relation between a moving charge distribution associated with the combustion wave and the resulting magnetic field. Certain reactions exhibi t power law behavior in the noise spectra and probability distributions of magnetic field peak amplitudes, consistent with self-organized criticality.