Elastic and anelastic properties close to the Curie temperature of Fe-based bulk metallic glass

摘要

Linear and non-linear ultrasonic damping, Young's modulus, and non-linear modulus defect have been studied in a Fe-based bulk metallic glass close to its Curie temperature, T_C. We found that the acoustic technique used offers four different parameters which can be used to evaluate the T_C.. We show that ultrasonic measurements at a frequency of around 10~5 Hz detect both critical phenomena close to T_C and intrinsic magnetomechanical damping in the ferromagnetic state. However, the values of absorption and Young's modulus anomaly observed over the critical range are quite low and do not permit reliable analysis of the critical exponents.