Thermoremanent and chemical magnetization of exsolution products of nanosized titanomagnetites

Models of Maghematization: Observational Evidence in Support of a Magnetic Unstable Zone

“…(2003) predicted that for near uniaxial magnetite grains of between 30 and 150 nm in size (side length of equivalent cubic volume), magnetostatic interactions in powders are likely to decrease B c and M rs / M s by percentages P h and P m of ∼17% and ∼18%, respectively (Afremov et al., 2018; Fidler & Schrefl, 1996; Muxworthy et al., 2003). We might expect the dipole‐dipole interaction to be proportional to the particles’ decreasing saturation magnetization as the oxidation process occurs (Afremov et al., 2018; Anisimov & Afremov, 2018). Therefore, in order to simulate hysteresis behavior for a powdered sample we might reasonably apply a simple interaction field correction and similarly where B ini and M rs , ini are the initial coercivity and saturation remanence of oxidized magnetite calculated by the average over a lognormal distribution of grain sizes, where B cor and M rs , cor are the counterparts after the interaction field correction, and B mag and M rs , mag are the corresponding equivalents of stoichiometric magnetite.…”