Preparation of amorphous metallic glass transducers for use in fiber optic magnetic sensors

An important figure of merit for fiber optic magnetometers is the effective C parameter Ceff relating magnetostriction e to applied field H: e=CeffH2. We describe both the annealing and the characterization after annealing of cylindrical metallic glass transducers and present the results of measurements of Ceff for various anneal temperatures, times, and magnetic field strengths for flat Metglas 2605‐S2 samples. Ceff values of (2.0–2.5)×10−6 Oe−2 are observed in the annealed flat strip and cylindrical samples studied here.