Magnetic Annealing and Directional Ordering of an Amorphous Ferromagnetic Alloy

The amorphous ferromagnetic alloy ${\mathrm{Fe}}_{75}$ ${\mathrm{P}}_{15}$ ${\mathrm{C}}_{10}$ has been found to respond reversibly to magnetic annealing treatments. The response has been studied (a) by measurements of the $\Delta E$ effect, which is unusually large, (b) by measurements of the magnetostriction, and (c) by torque curves which yield a value of 550 erg/${\mathrm{cm}}^3$ for the uniaxial anisotropy parameter $K_u$. Internal-friction measurements reveal that the alloy is also susceptible to stress-induced ordering, with an activation energy of 2.2 eV.