Interacting vs. non-interacting single domain behavior in natural and synthetic samples

Abstract The disparity in response to high alternating field (AF) demagnetization for samples containing fine magnetic carriers is apparently related to the degree of interactions between those carriers. The presence of interaction fields between single domain (SD) grains can be tested by plotting isothermal remanence (IRM) acquisition vs. saturation remanence (SIRM) demagnetization. For the case of non-interacting SD grains, the two curves will be symmetrical. For the interacting SD case, the acquisition curve will be steepest at higher fields, and the demagnetization curve steepest at lower fields, resulting in non-symmetry. The point of intersection of the two curves approximates the remanent coercive force ( H RC ) field for all cases. Minor hysteresis loops and anhysteretic remanence (ARM) acquisition curves are also strongly influenced by interaction fields. Because of the difficulty in dispersing strongly magnetic grains, fine grained synthetic samples made with highly magnetic materials will not display equivalent AF stability to natural samples with fine, dispersed grains.

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