Co67.5Fe4.5Ni3Si10B15非晶丝巨磁阻抗性能及其温度稳定性研究

研究了Co67.5Fe4.5Ni3Si10B15非晶丝巨磁阻抗性能及其温度特性。该非晶丝采用内圆水纺法制备,并在氮气保护下进行直流应力退火。在氮气中退火的非晶丝样品具有良好的表面光洁度以及较好的软磁性能和巨磁阻抗效应(GMI)。在激励功率6dBm、激励频率70MHz的测试条件下,磁阻抗变化率高达125%,巨磁阻抗最大灵敏度达3.92%/A·m-1。该非晶丝的巨磁阻抗性能在233～353K温度范围内具有优异的温度稳定性,为非晶丝应用于工业磁传感器等领域奠定了基础。

Giant Magneto-Impedance Effect and Thermal Properties of the Co67.5Fe4.5Ni3Si10B15 Amorphous Wires

The giant magneto-impedance (GMI) effect and thermal properties of the Co67.5Fe4.5Ni3Si10B15 amorphous wires, which were prepared by the in-rotating water spinning technique and annealed by passing through a direct current with a tensile stress in N2 atmosphere were investigated. After annealing in N2, the amorphous wire sample exhibits preferable brightness, soft magnetic properties and giant magneto-impedance effect. When the measurement was carried out with an exciting power of 6 dBm and an exciting frequency of 70 MHz, the samples were characterized with the largest impedance change of 125% and the biggest sensitivity of 3.92%/A·m-1. The Co67.5Fe4.5Ni3Si10B15 amorphous wires have the excellent thermal stability in the temperature range of 233-353 K, which makes this kind of amorphous wires promising materials in magnetic sensor application fields.