Mictomagnetism and Magnetic After-Effect in Fe–Hf Amorphous Alloys

Abstract

Magnetization in high magnetic fields, thermomagnetization curves at low fields, hysteresis loops after field cooling and magnetic after-effect in the initial magnetization region have been investigated for Fe–Hf amorphous alloys containing 7.5–39 at.%Hf. The present results indicate the mictomagnetism or the Fe-rich alloys and the normal ferromagnetism of the alloys containing above 20 at.%Hf. The magnetic after-effect in the mictomagnetic alloys is explained on the basis of the thermal fluctuation theory using a domain wall pinning model.