Supermendur, available in small quantity by special order, is a highly refined 50% cobalt-iron alloy. It is specially processed and annealed to develop high squareness and high saturation flux density. Supermendur serves well in devices requiring extreme miniaturization and high operating temperatures. It can be used in the same types of applications as Magnesil; however, due to its higher flux density (approximately 21,000 gausses), reduction in core size and weight may be accomplished. It has the highest Curie temperature of any of the available square loop alloys, so it will find applications in high temperature work.

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