On the mechanisms limiting power loss in amorphous CoFeB-based melt-spun ribbons

[Display omitted] •More than 90% of total power loss in amorphous ribbons is due to anomalous loss.•Transverse magnetic annealing causes notable reduction in anomalous loss.•Decline in anomalous loss is due to reorientation of easy axis of ribbons and decrease in domain width. The mechanisms that li...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-05, Vol.502, p.166535, Article 166535
Main Authors: Ahmadian Baghbaderani, Hasan, Masood, Ansar, Pavlovic, Zoran, L. Alvarez, Kenny, ÓMathúna, Cian, McCloskey, Paul, Stamenov, Plamen
Format: Article
Language:English
Subjects:
Amorphous alloy
Annealing
Domain walls
Eddy currents
Electric power supplies
Magnetic annealing
Magnetic properties
Magnetization process
Magnetization reversal
Magnetostructural transformations
Measurement methods
Melt spinning
Power supplies
Rotation
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Summary:[Display omitted] •More than 90% of total power loss in amorphous ribbons is due to anomalous loss.•Transverse magnetic annealing causes notable reduction in anomalous loss.•Decline in anomalous loss is due to reorientation of easy axis of ribbons and decrease in domain width. The mechanisms that limit the power loss performance in melt-spun amorphous ribbons have been investigated through DC and AC magnetic characterization methods. The measured total power loss is resolved into hysteresis, eddy current, and anomalous losses. The anomalous loss is found to account for more than 90% of the total loss, which significantly reduced by annealing in a transverse magnetic field. This is attributed to the reorientation of preferred magnetisation axis perpendicular to the length of ribbons. Transverse magnetic annealing promotes the relative contribution of domain rotation over domain wall motion during magnetisation reversal process. Magnetic annealing also causes a measurable decrease in the domain width, which promotes pinning and inhibits domain wall motion, thus further favoring coherent domain rotation as the primary mechanism of magnetization. This combination accounts for a 75% decrease in the total power loss in the so-processed ribbons and renders them attractive for applications in mid-and high-frequency power supplies and inverters.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.166535