biostudies-literatureMa YNational Natural Science Foundation of China (National Science Foundation of China)10549https://www.ebi.ac.uk/biostudies/studies/S-EPMC11618367biostudies-literatureUnknown15(1)Soft-magnetic fibers (SMFs) play a crucial role in energy conversion, transmission, and storage within electronic devices. However, conventional SMFs have poor plasticity and are therefore difficult to withstand long-term tensile, torsional, and shear deformation. A high fraction of grain boundaries could improve plastic deformability of conventional SMFs, but deteriorates the coercivity. This severely limits their applications in flexible electronics and multifunctional components. Herein, we propose a strategy to overcome this dilemma, which is realized by coarsening the grains of a Fe₃₄Co₂₉Ni₂₉Al₃Ta₃Si₂ high entropy alloy (HEA) fiber containing ordered coherent nanoprecipitates with small lattice misfit via a simple one-step in-rotating-water spinning method. This allows to reduce domain wall pinning and improve dislocation mobility. The resultant micron-diameter soft-magnetic HEA fiber has a tensile strength of 674 MPa at 23% elongation, a low coercivity of 8.1 Oe, a moderate magnetization of 116 emu/g at 10 kOe and a high Curie temperature of 770 K.Nature communicationsA one-step fabrication of soft-magnetic high entropy alloy fiber with excellent strength and flexibility.PMC1161836752301158Liu HYang WMan QLi ZLi JDong YInoue AMa YHe AKou ZfalseA one-step fabrication of soft-magnetic high entropy alloy fiber with excellent strength and flexibility.Soft-magnetic fibers (SMFs) play a crucial role in energy conversion, transmission, and storage within electronic devices. However, conventional SMFs have poor plasticity and are therefore difficult to withstand long-term tensile, torsional, and shear deformation. A high fraction of grain boundaries could improve plastic deformability of conventional SMFs, but deteriorates the coercivity. This severely limits their applications in flexible electronics and multifunctional components. Herein, we propose a strategy to overcome this dilemma, which is realized by coarsening the grains of a Fe₃₄Co₂₉Ni₂₉Al₃Ta₃Si₂ high entropy alloy (HEA) fiber containing ordered coherent nanoprecipitates with small lattice misfit via a simple one-step in-rotating-water spinning method. This allows to reduce domain wall pinning and improve dislocation mobility. The resultant micron-diameter soft-magnetic HEA fiber has a tensile strength of 674 MPa at 23% elongation, a low coercivity of 8.1 Oe, a moderate magnetization of 116 emu/g at 10 kOe and a high Curie temperature of 770 K.2024-01-01T00:00:00Z2024 Dec2025-04-18T12:56:15.275Z2025-04-06T22:21:31.452ZS-EPMC116183673963289210.1038/s41467-024-54984-7