Magnetovolume Effects In Fe-Ti Sputtered Amorphous-Alloys

Magnetovolume effects in Fe–Ti amorphous alloys prepared by high-rate sputtering have been investigated. The Curie temperature decreases linearly with increasing Ti content, whereas the magnetic moment varies gradually at the low Ti contents. The spontaneous volume magnetostriction is about 4.5×10−3, being much smaller than that of Fe–B and Fe–Ni Invar alloys. On the other hand, the high-field susceptibility and the pressure coefficient of the Curie temperature are about two times larger than those of Fe–B and Fe–Ni Invar alloys. From the present results, the density of states at the Fermi surface seems to be high. The present alloys are expected to be inhomogeneous because the pressure dependence curves of the Curie temperature are convex downward deviating from the straight line and the large thermal expansion anomaly is observed even above the Curie temperature.