Production of Anisotropy in a Permanent Magnet by Pressure

Abstract

H. P. J. WIJN and others1 have described a novel method of making ‘Ferroxcube’ with a square hysteresis loop. Glass with a higher coefficient of expansion than the ‘Ferroxcube’ was fixed to a ring-shaped sample at an elevated temperature; the resulting strain at room temperature produced a square hysteresis loop. An experiment has been performed to show that a similar effect is possible with a permanent magnet alloy.