Low-temperature warming of SIRM to 10K (Fig. 2b), clearly reveals the Verwey transition, and is
indicative of near stoichiometric magnetite. The hysteresis parameter of coercivity (HC) is plotted as a
function of temperature (15 K to 295 K) in Fig. 2c and displays HC behaviour typical of SD or small
PSD magnetite [7], i.e., on warming HC drops at 15K, until the Verwey transition, followed by a
gradual drop from 16 to 13 mT on warming to room temperature; such behaviour has been previously
predicted [8]. The FORC diagram of Fig. 2d was measured at 15 K after ZFC and exhibited behaviour
characteristic of SD grains displaying moderate inter-particle magnetostatic interactions [9].
Low-temperature warming of SIRM to 10K (Fig. 2b), clearly reveals the Verwey transition, and isindicative of near stoichiometric magnetite. The hysteresis parameter of coercivity (HC) is plotted as afunction of temperature (15 K to 295 K) in Fig. 2c and displays HC behaviour typical of SD or smallPSD magnetite [7], i.e., on warming HC drops at 15K, until the Verwey transition, followed by agradual drop from 16 to 13 mT on warming to room temperature; such behaviour has been previouslypredicted [8]. The FORC diagram of Fig. 2d was measured at 15 K after ZFC and exhibited behaviourcharacteristic of SD grains displaying moderate inter-particle magnetostatic interactions [9].
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