焦耳-应力退火对Co基薄带巨磁阻抗的影响  

Effect of Joule-stress current annealing on the giant magneto impedance effect of Co-based ribbons

作　　者：张树玲 甘志颖[1] 刘慧娴 高露露 丁文捷 ZHANG Shuling;GAN Zhiying;LIU Huixian;GAO Lulu;DING Wenjie(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Mechanical Engineering,Ningxia University,Ningxia 750001,China;School of Information and Control Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]宁夏大学机械工程学院,银川750001 [3]青岛理工大学信息与控制工程学院,山东青岛266520

出　　处：《功能材料》2023年第1期1154-1158,共5页Journal of Functional Materials

基　　金：国家自然科学基金项目(51861031)。

摘　　要：采用焦耳-应力退火处理了Co_(83.2)Fe_(5.2)Si_(8.8)B_(2.8)非晶薄带,利用阻抗分析仪和磁光克尔效应显微镜分析了焦耳-应力退火前后Co基薄带的巨磁阻抗效应和磁畴结构。结果表明,经焦耳-应力退火后,薄带的GMI效应得到提高,24.5 MPa焦耳-应力退火后,0.4 MHz时,薄带的最大阻抗变化率达到47.6%,1 MHz时,其磁场响应灵敏度达到280.2%/(kA/m)。磁畴观察发现,随退火过程中拉应力的施加,薄带表层横向带状畴内部逐渐形成细小纵向畴,同时横向带状畴逐渐向纵向偏转,表明对于具有负磁滞伸缩系数的Co基薄带,焦耳-应力退火可以促进薄带内衍生纵向细畴,且纵向拉应力的施加,增强了薄带的纵向各向异性。因此,焦耳-应力退火改善了薄带的低频纵向驱动GMI效应,磁场响应灵敏度也大幅度提高。The Co_(83.2)Fe_(5.2)Si_(8.8)B_(2.8)amorphous ribbons were prepared and treated by Joule-stress current annealing.The giant magneto impedance,GMI effect and domain structure of these ribbons before and after annealing were analyzed and observed by impedance analyzer and magneto-optical Kerr effect microscope.The results show that the GMI effect is improved after Joule-stress current treatment.The maximum impedance ratio reaches 47.6%at 0.4 MHz,and the magnetic field response sensitivity is up to 280.2%/(kA/m)at 1 MHz after Joule annealing applied tensile stress of 24.5 MPa.The magnetic domain investigation shows that refined finger-like domains are gradually formed inside the transverse band-like domains in the annealed ribbons.What’s more,the transverse band-like domains are gradually deflected to the longitudinal direction induced by the application of tensile stresses.Joule-stress annealing can induce the formation of longitudinal fine domains inside transverse domains in the surface of Co-based ribbons with negative hysteresis coefficient,and the application of longitudinal tensile stress enhances the longitudinal anisotropy.Consequently,the longitudinally driven GMI effect and the sensitivity of magnetic field response at low frequency are greatly improved.

关 键 词：应力退火 巨磁阻抗效应 Co基薄带 磁化 

分 类 号：TG139.8[一般工业技术—材料科学与工程]