Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 560, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2022.169639
Keywords
High-frequency soft magnetic properties; Averaged magnetocrystalline anisotropy; Field-induced anisotropy; Orientation; Transverse magnetic field annealing
Funding
- National Natural Science Foundation of China [51771215]
- Public Projects of Zhejiang Province [LGG20E010003]
- Shanxi Scholarship Council of China [HGKY2019083]
- Shanxi Provin-cial Key Research and Development Project [201803D421046]
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The effect of anisotropy and microstructure on the high-frequency magnetic properties of nanocrystalline Fe77.8Si11.6B7Nb2Cu0.6P1 toroidal cores has been studied. The optimal soft magnetic characteristics were obtained when the < K-1 >/Ku ratio was approximately 1.
Several electronic devices require alloys with excellent soft magnetic properties, for further advancement. The effect of anisotropy and microstructure, particularly concerning grain orientation, on the high-frequency (100 kHz) magnetic properties of nanocrystalline Fe77.8Si11.6B7Nb2Cu0.6P1 toroidal cores has been studied. The field-induced anisotropy (K-u) of the cores was induced by applying transverse field annealing (TFA) with a magnetic field of 0.08 T at annealing temperatures ranging from 320 degrees C to 540 degrees C after having been optimally nanocrystallized by normal annealing (NA). The high-frequency magnetic properties were found to be affected by the competition between K-u and the averaged magnetocrystalline anisotropy (). The optimal soft magnetic characteristics, i.e., high saturation magnetization of 1.5 T, high permeability of 18,400 (100 kHz, 0.06 A/m), low coercivity of 1.7 A/m, and low core loss of 209 kW/m(3) (100 kHz, 0.2 T), were obtained when the < K-1>/K-u ratio was approximately 1. With further increase in the TFA temperature, the texture of the alpha-Fe(Si) grains in the < 100 > direction became more prominent, leading to an increase in < K-1> and consequently deteriorating the soft magnetic properties. A bi-anisotropy and microstructure interaction model was established based on the experimental results, it can provide guidance for optimizing the high-frequency magnetic performance of Fe-based nanocrystalline alloys.
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