空气中温度退火FeCo基薄带的巨磁阻抗效应

The GMI effect of FeCo-based ribbon annealed in atmosphere

通过单辊快淬法制备出Fe36Co36Nb4Si4.8B19.2非晶薄带,在空气中进行不同温度退火.采用HP4294A型阻抗分析仪测试样品的纵向驱动巨磁阻抗效应(LDGMI),分析得到了系列LDGMI曲线特征,发现温度退火可以使FeCo基合金薄带感生横向的易磁化结构.退火温度为290～530℃时,LDGMI曲线为双峰形式;退火温度为530～600℃,LDGMI曲线呈现出单峰与双峰叠加的组合峰形态;退火温度为600℃以上时,样品的表面氧化与内部磁结构相互耦合,展现出具有良好线性的单峰GMI曲线.表明一定的退火温度下可以得到良好线性的单峰LDGMI曲线.

The Fe36 Co36Nb4Si4.8 B19.2 amorphous ribbon was prepared by single roller quench and annealed in atmosphere. The longitudinally driven giant magneto-impedence（ LDGMI ） effect of conventional annealing Fe- Co-based ribbons were measured with HP4294A impedance analyzer. The LDGMI curves of FeCo-based ribbon showed that the transverse magnetic easy axial induced after the conventional annealling the LDGMI effect curves demonstrated double-peak behavior between 290 - 530 ℃, in the range of 530 ℃ and 600 ℃ the LDG- MI effect curves showed a superposition of single-peak and double-peak, above 600 ℃ the LDGMI effect curves presentesed single-peak with a good linearity, This was probably caused by the coupling between the oxidation of the surface and internal magnetic structure, that is, a certain annealing temperature would induce good linear single-peak LDGMI curve.