采用单辊快淬法制备Fe36Co36Nb4Si4.8B19.2(FeCo基)合金非晶薄带, 流动气体中外加张应力电流退火的方法制备不同磁结构的样品. 采用阻抗仪测量各样品的纵向驱动巨磁阻抗(LDGMI)效应曲线. 通过比对分析不同应力退火样品的LDGMI曲线特征参量(半高宽、最大巨磁阻抗比值)与驱动频率之间关系曲线的差异, 以及比对不同腐蚀深度样品的差异, 依据趋肤效应原理及LDGMI曲线与材料磁各向异性关系的理论, 揭示了FeCo基非晶薄带应力退火感生磁结构的特性及机理.
The FeCo-based ribbons (Fe36Co36Nb4Si4.8B19.2) with dirrerent magnetic structures were prepared by single roller quenched method and then annealed with direct current under tensile stress in flowing atmosphere. The longitudinally driven giant magneto-impedance (LDGMI) effect in the stress-Joule-heated FeCo-based ribbon was measured with HP4294A impedance analyzer. The dependences between the characteristic parameters of the LDGMI profiles, ratio of giant magneto-impedance and half-height width of the applied magnetic field at the bottom, and driving current frequency were analyzed. The difference of the LDGMI profiles of the annealed FeCo-based ribbons with various remained thicknesses obtained by etching with 16.7% HCl solution was compared. The mechanism and the character of the stress-induced magnetic structure in FeCo-based ribbons were exposured by means of the principle of the skin effect and the theory of the dependence of giant magneto-impedance on the magnetic anisotropy in the magnetic materials.
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