ISOTHERMAL MAGNETIZATION OF SAMPLES WITH STABLE PREISACH FUNCTION - ASURVEY OF HYSTERESIS, REMANENCE, AND ROCK MAGNETIC PARAMETERS

Isothermal magnetization curves, like hysteresis loops, initial curves , back field curves, acquisition curves and demagnetizing curves of is othermal remanent magnetization, are commonly used for rock magnetic p urposes, In this study we investigate the relations among these curves and other useful magnetization curves (saturation initial curve and i nduced and remanent hysteretic magnetization curves) in order to compa re coercivity and domain state parameters which can be derived from th em, Most natural samples, especially sediments, are weakly magnetic an d possess relatively stable Preisach functions. Their magnetization st ates dan therefore be described by classical Preisach theory, This app roach verifies well-known rules and establishes some formerly unreport ed relations between isothermal magnetization curves and parameters, I t is possible to point out sets of mathematically independent isotherm al magnetization curves and to state theoretical interrelations betwee n dependent curves by simply inspecting Preisach diagrams. Furthermore , we define six elemental isothermal magnetization curves from a gener al partition scheme of the Preisach diagram, They can be easily obtain ed from common measurements and generate all above mentioned curves. T he experimental applicability of our results is demonstrated for three (single-domain, pseudo-single-domain, multidomain) marine sediment sa mples, A physical rationale of the elemental curves reveals favorable properties for the investigation of interaction and domain state. As a spin-off from the general results, a new hysteresis-based procedure f or the measurement of H-cr is presented, We also propose an apparently more robust hysteresis-derived domain state parameter and a generaliz ed version of the well-known R parameter. All presented methods can be applied without actually measuring Preisach functions.