MATTEUCHI EFFECT IN AMORPHOUS-ALLOYS

The Mattevchi effect is the induction of a time varying EMF on the end s of a ferromagnetic material which has been placed in a variable magn etic field. Recently, this effect has been finding wider practical app lication as a result of its high sensitivity to external effects and i ts easy measurability (no need of special measurement coils). In this study the Matteuchi effect is examined in amorphous alloys based on Fe and Co. The Matteuchi EMF is measured as a function of magnetic field s, which vary in frequency and amplitude. The dependency of the Matteu chi EMF in various amorphous alloys on the rate of change of the magne tic field was determined. A new type of Matteuchi effect having two EM F maximums close to the coercive field has been discovered. The size o f the maximum sensitivity to mechanical effects and their location dep ends on the frequency and amplitude of the external field.