FeCo基薄带气流中应力退火感生的磁结构

来源期刊：金属学报2011年第4期

论文作者：方允樟 许启明 叶慧群 范晓珍 裘剑锋

文章页码：475 - 481

关键词：FeCo基合金； 磁各向异性； 非晶； 电流退火； 应力； 巨磁阻抗

Key words：FeCo-based alloy； magnetic anisotropy； amorphous； current annealing； stress； giant magneto-impedance

摘    要：采用单辊快淬法制备Fe₃₆Co₃₆Nb₄Si_4.8B_19.2(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.

Abstract: The FeCo-based ribbons (Fe₃₆Co₃₆Nb₄Si_4.8B_19.2) 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.