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Open AccessArticle

Magnetic Properties in Finemet-Type Soft Magnetic Toroidal Cores Annealed under Radial Stresses

by Zhiyong Xue 1,*,†, Xuesong Li 1,†, Sajad Sohrabi 2, Yu Ren 1,3 and Weihua Wang 1,2,4
1
Institute of Advanced Materials, North China Electric Power University, Beijing 102206, China
2
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3
Beijing Huadian New Energy & Electrical Materials Research Institute Co., Ltd., Beijing 102206, China
4
Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
*
Author to whom correspondence should be addressed.
These two authors are first co-authors.
Metals 2020, 10(1), 122; https://doi.org/10.3390/met10010122
Received: 17 December 2019 / Revised: 3 January 2020 / Accepted: 7 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Forming and Heat Treatment of Modern Metallic Materials)
Applying tensile stresses on straight soft magnetic ribbons before core fabrication is a routine method of inducing magnetic anisotropy, while methods of stress annealing of ribbons after core winding are seldom explored. In this study, we utilize a novel approach to induce magnetic anisotropy by applying radial stresses on tape-wound cores of Fe73.5Si13.5B9Cu3Nb1 (at. %) ribbon during crystallization heat treatment. The results show that while stress annealing does not change the structural characteristics of annealed samples, the magnetic anisotropies induced can increase to values ~3–5 times larger than the sample annealed in the absence of external stress. This increase in magnetic anisotropy energy is associated with ~25–50% decrease of magnetic inductance in the treated cores. These results suggest that the magnetic properties of nanocrystalline soft magnetic alloys can be effectively tuned by applying radial stresses. View Full-Text
Keywords: stress annealing; induced magnetic anisotropy; finemet stress annealing; induced magnetic anisotropy; finemet
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MDPI and ACS Style

Xue, Z.; Li, X.; Sohrabi, S.; Ren, Y.; Wang, W. Magnetic Properties in Finemet-Type Soft Magnetic Toroidal Cores Annealed under Radial Stresses. Metals 2020, 10, 122.

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