应力退火调控环形磁芯对电流的响应特性

Stress Annealing Controlling the Response of the Toroidal Core to Current

摘要: 本研究采用单辊快淬法制备Fe_73.5Cu₁Nb₃Si_13.5B₉非晶合金薄带，在550℃条件下进行快速张应力退火，盘绕制成实验所需的纳米晶环形磁芯样品。对磁芯样品缠绕线圈，使用示波器观测磁芯对通电导线产生的交变环向磁场的感生电压响应；使用阻抗分析仪测量磁芯对直流导线的巨磁阻抗响应，研究张应力对纳米晶环形磁芯磁性能影响。结果表明，退火应力影响环形磁芯对交变电流响应的灵敏度和线性度，当应力低于80.63 MPa时线性度低于99.9%，而灵敏度随着应力的增大逐渐下降。随着退火应力增大，环形磁芯对直流电流的阻抗响应的灵敏度持续下降，线性区间逐渐向强磁场方向移动。退火应力对环形磁芯的磁性能有重大影响，本研究对优化环形磁芯磁性能具有指导意义。

Abstract: In this study, Fe_73.5Cu₁Nb₃Si_13.5B₉ amorphous alloy thin strip was prepared by a single roll fast quenching method, and the nanocrystalline ring core sample was coiling after rapid tensile stress annealing at 550˚C. Oscilloscope was used to observe the voltage response of the magnetic core to the alternating toroidal magnetic field generated by the current conductor. Impedance analyzer was used to measure the giant magnetoimpedance response of magnetic core to DC conductor, and the influence of tensile stress on the magnetic properties of nanocrystalline ring magnetic core was studied. The results show that the annealing stress affects the response sensitivity and linearity of the toroidal core to alternating current. When the stress is lower than 80.63 MPa, the linearity is lower than 99.9%, and the sensitivity decreases with the increase of stress. With the increase of annealing stress, the sensitivity of the impedance response of the toroidal core to the DC current decreases continuously, and the linear range gradually moves to the direction of the strong magnetic field. The annealing stress has a great influence on the magnetic properties of the toroidal core, and this study has guiding significance for optimizing the magnetic properties of the toroidal core.