The ZHinstruments SM150L and SM150H susceptibility meters measure magnetic susceptibility at room temperature. Using both instruments, susceptibility can be measured between 63Hz and 512kHz. The sensitivity of the instruments ranges between 2.0 x 10-5 SI and 1.0 x 10-6 SI, depending on the measurement frequency used. Measuring the frequency-dependence of magnetic susceptibility over a wide range of frequencies allows for the characterization of the superparamagnetic grainsize component of a sample.
Professor of Physics and Environmental Science
