Abstract
Composite samples containing either magnetized iron or a ferrite magnet embedded in ulvöspinel have been cooled through the ulvöspinel Curie point. The observed changes in magnetic moment which occur are shown to be a result of TRM acquisition in the ulvöspinel rather than an effect of high permeability. Nevertheless by defining an effective permeability of about (1 + TRM/ H), magnetostatic theory relevant to magnetized inclusions in a permeable medium can be applied to explain the main features observed in this system.
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