Improvement of soft-magnetic properties for Fe-based amorphous alloys with high saturation polarization by stress annealing
Mingjuan Cai, Jing Jing Wang, Qianqian Wang, Zhijun Guo, Qiang Luo, Jing Zhou, Tao Liang, Xuesong Li, Qiaoshi Zeng, Baolong Shen
Abstract
Stress annealing is utilized for enhancing the magnetic softness of Fe83–xCoxB10Si3C3P1 (x = 0–16) amorphous alloys with saturation polarization up to 1.75 T. All of the stress-annealed alloys exhibit improved soft-magnetic properties, including low coercivity of 1.8–2.2 A/m, low core loss of 0.09–0.11 W/kg at 1.0 T and 50 Hz, and high permeability of 27,000–33,200 at 5 A/m and 1 kHz. Stress annealing induces longitudinal magnetic anisotropy and facilitates the annihilation of free volume, leading to pinning-free domain wall motion, and thus the enhanced magnetic softness. The induced magnetic anisotropy relates to the constrained elastic elongation introduced by stress annealing.