Fe_(89)Zr_7B_4退火薄带的纳米晶结构、巨磁阻抗和磁导率变化  

Nanostructure, Giant Magnetoimpedance and Permeability Change of Fe_89Zr_7B_4 Annealed Ribbons

作　　者：秦宏伟[1] 安康[1] 韩涛[1] 李波[2] 喻晓军[2] 胡季帆[1] 蒋民华[1] 

机构地区：[1]山东大学晶体材料国家重点实验室,山东济南250100 [2]钢铁研究总院,北京100081

出　　处：《稀有金属材料与工程》2005年第12期1875-1878,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50271036)

摘　　要：Fe_(89)Zr_7B4薄带在550℃～720℃的温度范围内分别退火20min,析出晶粒为13nm～17nm的α-Fe。720℃退火时有微量的第二相析出。Fe_(89)Zr_7B_4纳米晶薄带的巨磁阻抗效应与退火温度紧密相关,存在一个最佳退火温度,约为650℃。进一步的实验结果显示：Fe_(89)Zr_7B_4纳米晶薄带在直流磁场引导下横向磁导率的变化率在650℃存在最大值。经典电磁理论与磁谱结合的模型能较好地描述Fe_(89)Zr_7B_4纳米晶薄带磁阻抗与频率的依赖关系。实验数据和理论计算结果均表明,巨磁阻抗效应与磁场引导的横向磁导率的变化紧密相关。α-Fe nanograins with a size of 13 nm-17 nm precipitate in Fe89Zr7B4 ribbons annealed in the temperature range of 550℃-720℃ for 20 min. There is a little of second phase precipitated in ribbons annealed at 720℃. There is an optimal annealing temperature, about 650℃, for obtaining largest magnetoimpedance. Results show that the change of transverse permeability induced by dc magnetic fields has its maximum at 650℃. The model based on the classical electromagnetism theory and the magnetic spectra can well describe the frequency dependence of magnetoimpedance of Fe89Zr7B4 nanocrystalline ribbons. Our experimental and calculated results indicated that the giant magnetoimpedance effect is strongly connected with the change of transverse permeability.

关 键 词：Fe-Zr-B合金 纳米晶薄带 巨磁阻抗效应 磁导率 

分 类 号：TB383.1[一般工业技术—材料科学与工程]