Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9纳米晶薄带的巨磁阻抗效应  

Giant magnetoimpedance effect in Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 nanocrystalline ribbons

作　　者：胡怀谷[1] 郝延明[1] 梁飞飞[1] 高纯静[1] 

机构地区：[1]天津科技大学理学院,天津300457

出　　处：《金属功能材料》2015年第4期21-24,共4页Metallic Functional Materials

摘　　要：Fe72.5Cu1Nb2V2Si13.5B9非晶薄带经晶化退火处理,随退火温度增加,析出纳米晶bccα-Fe(Si)相,当超过550℃,薄带在析出纳米晶bccα-Fe(Si)的同时,还析出硬磁性的Fe2B相。Fe72.5Cu1Nb2V2Si13.5B9纳米晶薄带具有巨磁阻抗(GMI)效应,其效应强度灵敏依赖于退火温度,当退火温度为550℃、退火时间为30 min时,bccα-Fe(Si)平均晶粒尺寸约为16nm,其巨磁阻抗存在最大值。巨磁阻抗效应还强烈依赖于频率。对于550℃退火30min的Fe72.5Cu1Nb2V2Si13.5B9纳米晶薄带,其在50kHz下,ΔX/X(H=7 162A/m)可达到-500%,3 MHz下,ΔR/R(H=7 162A/m)约为-150%。700kHz下,GMI效应值有最大值,ΔZ/Z(H=7 162A/m)约为-121%。The nanophase bccα-Fe（Si）crystallizes from Fe72.5Cu1Nb2V2Si13.5B9 ribbon through thermal annealing.When the annealing temperature is higher than 550 ℃,the hardmagnetic phase Fe2 B occurs accompanying with nanophase bccα-Fe（Si）.The nanocrystalline Fe72.5Cu1Nb2V2Si13.5B9 ribbons exhibit giant magnetoimpedance（GMI）effect,which sensitively depends on the annealing temperature.The optimal annealing temperature for obtaining stronger GMI is 550℃,where the average grain size ofα-Fe（Si）is about 16 nm.The GMI effect also strongly depends upon the frequency.For Fe72.5Cu1Nb2V2Si13.5B9 nanocrystalline ribbon annealed at 550℃for 30 min,ΔX/X under H=7162A/m reaches-500%at 50 kHz,ΔR/Runder H=7 162A/m is-150%at 3MHz,andΔZ/Zis-121%at 700 kHz.

关 键 词：Fe基纳米晶薄带 巨磁阻抗效应 退火温度 频率 

分 类 号：TM271.2[一般工业技术—材料科学与工程]