HIGH-FREQUENCY MAGNETIC-PROPERTIES OF AN AMORPHOUS FE78B13SI9 RIBBON IMPROVED BY AC JOULE HEATING

[摘要] A straight specimen of amorphous Fe78B13Si9 ribbon was heated by passing an a.c. current through the specimen. In addition to the Joule effect, the current-induced magnetic field was combined with a high d.c. applied magnetic field along the longitudinal direction of the specimen to improve the magnetic properties. Under the applied testing magnetic field H(a) = 2 Oe, the magnetic induction B(m) congruent-to 14.5 kG for the heat-treated specimen is much better than the magnetic induction B(m) congruent-to 8.7 kG for the as-cast specimen. The remanence ratio of the heat-treated specimen ranges from B(r)/B(m) = 0.55 at f = 20 Hz to B(r)/B(m) = 0.89 at f = 20 kHz, while the remanence ratio of the as-cast specimen is from B(r)/B(m) = 0.23 at f = 20 Hz to B(r)/B(m) = 0.46 at f = 20 kHz. This shows that the heat-treated specimen has the desired squareness of the B-H loop for some applications at high frequencies.

[发布日期] 1991-03-15

[效力级别]  Proceedings Paper