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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
Institute of Advanced Materials, North China Electric Power University, Beijing 102206, China
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Beijing Huadian New Energy & Electrical Materials Research Institute Co., Ltd., Beijing 102206, China
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;
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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