Magnetic induction heating of FeCr nanocrystalline alloys

In this work the thermal effects of magnetic induction heating in (FeCr)73.5Si13.5Cu1B9Nb3 amorphous and nanocrystalline wires were analyzed. A single piece of wire was immersed in a glass capillary filled with water and subjected to an ac magnetic field (frequency, 320 kHz). The initial temperature rise enabled the determination of the effective Specific Absorption Rate (SAR). Maximum SAR values are achieved for those samples displaying high magnetic susceptibility, where the eddy current losses dominate the induction heating behavior. Moreover, the amorphous sample with Curie temperature around room temperature displays characteristic features of self-regulated hyperthermia.

► Amorphous and nanocrystalline Fe based alloys with tailored Curie temperature of the amorphous phase.
► Induction heating effects under the action of a ac magnetic field.
► Self-regulated characteristics based on the control of the Curie temperature.
► Dominant role of the eddy-current losses in the self-heating phenomena.