Magnetic annealing and directional ordering of an amorphous ferromagnetic alloy

The amorphous ferromagnetic alloy Fe75P15C10 has been found to respond reversibly to magnetic annealing treatments. The response has been studied (a) by measurements of the ΔE effect, which is unusually large, (b) by measurements of the magnetostriction, and (c) by torque curves which yield a value of 550 erg/cm3 for the uniaxial anisotropy parameter Ku. Internal-friction measurements reveal that the alloy is also susceptible to stress-induced ordering, with an activation energy of 2.2 eV. © 1975 The American Physical Society.