IMPULSE ANNEALING AS POSSIBILITY OF MODIFICATION OF MAGNETIC PROPERTIES OF AMORPHOUS METALLIC ALLOYS
Jozef Kováč – Ladislav Novák – Lukáš Hubač
This paper introduces the construction of the device used for application of Joule heating on amorphous melt-spun ribbons with a pulse length of the order of 0.1 s. The electric current of pulse is about 21 A at frequency 50 Hz. The samples of ribbons are annealed utilizing series of pulses with total duration of 80 up to 120 ms. The annealing is performed directly in solenoid of magnetometer, which is used for the subsequent measurements of magnetic properties of processed materials. The significant improvement in the magnetic properties after pulse heating was achieved on the amorphous ribbons of FINEMET type.
Keywords: FINEMET, pulse heating, induced anisotropy, Curie temperature, coercivity