张应力退火对Fe基纳米晶合金薄带磁各向异性的影响  

Effect of tensile stress annealing on the magnetic anisotropy in Fe-based nanocrystalline ribbons

作　　者：张建强[1] 方允樟[2] 

机构地区：[1]天水师范学院物理与信息科学学院,甘肃天水741001 [2]浙江师范大学数理与信息工程学院,浙江金华321004

出　　处：《磁性材料及器件》2011年第6期20-23,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(50871104)

摘　　要：用单辊快淬法制备Fe73.5Cu1Nb3Si13.5B9非晶合金薄带,在氮气保护下沿薄带轴向分别施加不同张应力进行退火。采用阻抗仪和磁力显微镜(MFM)分别观测了不同张应力(?=0、171、378、570 MPa)退火Fe73.5Cu1Nb3Si13.5B9纳米晶合金薄带的纵向驱动巨磁阻抗效应(LDGMI)和表面磁畴结构。发现张应力感生的横向磁各向异性场Hk与外加张应力?和轴向应变?∥之间是线性相关的;自由退火样品具有迷宫状的磁畴结构;而张应力?=171MPa退火的样品为条带状磁畴结构,认为这种条带磁畴结构与张应力感生的横向磁各向异性分量有关。AmorphouseFe73.5Cu1Nb3Si13.5B9 ribbons were prepared using single roller melt-spinning, and were annealed in nitrogen atmosphere and by applying different tensile stresses parallel to the axis of the samples. The influence of tensile stress on the longitudinal driven gaint magneto-impedance effect of Fe73.5Cu1Nb3Si13.5B9 nanocrystalline ribbons annealed under different tensile stresses （0,171,378 and 570MPa） has been investigated by impedance-analyzer. It is proved that the stress-induced magnetic anisotropy shows a linear correlation with tensile stress and samples＇ strains of longitudinal direction. The magnetic domain of Fe-based nanocrystalline ribbons annealed without and with tensile stress （171MPa） was observed by magnetic force microscopy. It shows that the unstressed sample consists of maze domain while the stressed sample shows the strip domain. We suggest that the strip domain is responsible for the component of stress-induced transversal magnetic anisotropy.

关 键 词：Fe基纳米晶合金 张应力 巨磁阻抗(GMI) 磁各向异性 磁畴结构 

分 类 号：O482.5[理学—固体物理]