铁镍合金丝威德曼效应测量与磁畴结构  

Testing of Wiedemann Effect and Magnetic Domain of Fe-Ni Alloy Wires

作　　者：夏天[1,2] 高学绪[1] 李纪恒[1] 张亚飞[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室 [2]装备指挥技术学院士官系,北京102249

出　　处：《磁性材料及器件》2008年第2期21-25,共5页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(50771015)

摘　　要：采用拉拔法将铁镍合金锭(Fe100-xNix,x=30,45,60)冷拉至细丝后并进行900℃高温退火。使用自制的威德曼效应测量仪测量铁镍合金丝的威德曼效应。发现合金丝Fe40Ni60有较好的威德曼效应,特别是在退火后,(θ/L)max达到了141″/cm,退火使威德曼效应明显增强。利用磁力显微镜观察合金磁畴结构,发现了合金丝受应力作用后,磁畴有随应力方向排列的趋势,并增强了材料威德曼效应。分析了材料弹性性能以及其对威德曼效应的影响。The fine wire of Fe-Ni alloys （Fe1-xNix, x=30A5,60） were cold drawn from alloy ingots and annealed at 900℃. The Wiedemann effect of Fe-Ni alloy wires were measured by a self-made apparatus, It was found that the Fe40Ni60 alloy has stronger Wiedemann effect, and annealing strengthes the Wiedemann effect evidently, with maxium （θ/L）max value of 141″/cm, As an advantageous technique, magnetic force microscopy （MFM） and atomic force microscopy（AFM） were used for the observation of magnetic domain structures of ingots and wires of Fe-Ni alloy with different conditions. The magnetic domain orientates to the stress, resulting in an enhancement of Wiedemann effect. The influence of flexibility on the Wiedemann effect was discussed.

关 键 词：铁镍合金 威德曼效应 磁致伸缩 磁畴 

分 类 号：TG132.2[一般工业技术—材料科学与工程]