Abstract
A well-defined new magnetic relaxation phenomenon has recently1 been reported at high temperatures (400–500 K) in polycrystalline magnetite samples of composition Fe3−ΔO4 (10−5<Δ<10−1). We have found that when the temperature of such samples is raised to 650 K or more, on a second measurement of the aftereffects, this magnetic relaxation is found to have almost completely annealed out. This paper presents measurements of ac initial susceptibility and magnetic disaccommodation reflecting this annealing phenomenon. The influence of high-temperature annealing on magnetic properties is attributed to the attainment of a new thermodynamic equilibrium.
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