Abstract
IN making magnetic measurements on mineral powders, we found that certain iron ores, heated in reducing gases at about 600° C. for a short time and then passed over a high-intensity magnetic separator, could not be demagnetised in the customary manner. Complete demagnetisation was successful only under the following conditions: (1) high initial demagnetising fields; (2) slow reversals of the decreasing demagnetising field; and (3) packing the powder to prevent motion of the individual grains.
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GOTTSCHALK, V., DAVIS, C. A Magnetic Material of High Coercive Force. Nature 132, 513 (1933). https://doi.org/10.1038/132513a0
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DOI: https://doi.org/10.1038/132513a0
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