Treatment of low-frequency pulsating magnetic field on amorphous alloy Fe78Si9B13

Effect of low-frequency pulsating magnetic field on the microstructure and magnetic properties of amorphous alloy Fe78Si9B13 were investigated. The temperature rise induced by the treatment was measured by a non-contact infrared thermometer. The crystallization behavior and microstructure of specimens were studied by Mossbauer spectroscopy and transmission electron microscope (TEM). Magnetic properties of the specimens were investigated by alternating gradient magnetometer (AGM). The results show that the low-frequency pulsating magnetic field can promote the single-phase crystallization of amorphous alloy Fe78Si9B13. The frequency, f of applied field is from 10 to 40Hz, magnetic field, H is from 0.02 to 0.04T and treatment duration, t is from 180-300s. The volume fraction of crystallization phase (alpha-Fe(Si), the grain size, 2-10nm) is 3-7%. The temperature rise less than 7 deg C. Magnetic properties of samples are improved by magnetic field. The field's f is 40Hz, H is 0.0379T and t is 180s. The saturation induction Bs is 1.74T and the coercive force Hc is 10.35 (A/m).