Magnetic hysteresis in natural materials

摘要: Abstract Magnetic hysteresis loops and the derived ratios R H I are used to classify various natural dilute magnetic materials. is ratio of saturation isothermal remanence ( ) S magnetization, remanent coercive force C ). The values depend on grain size, characteristics separate size modes in mixtures grains high low coercivity, packing characteristics. Both affected by thermochemical alterations ferromagnetic fraction. Hysteresis loop constriction observed lunar samples, chondrite meteorites thermochemically-altered basaltic rocks, due components coercivity. Discrete ranges for terrestrial samples provide a classification these materials based their properties.