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 spectra are recorded with high-T/sub 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 describes the relation between a moving charge distribution associated with the combustion wave and the resulting magnetic field. Certain reactions exhibit power law behavior in the noise spectra and probability distributions of magnetic field peak amplitudes, consistent with self-organized criticality.