摘要
对Co68.15Fe4.35Si12.5B15非晶合金薄带进行低频脉冲磁场处理,Mssbauer谱分析及透射电镜(TEM)观察结果表明,样品发生了初始纳米晶化,晶化量与磁脉冲强度有关。采用巨磁阻抗(简称GMI)测量仪测量样品GMI,结果显示GMI与脉冲磁场强度HP呈非单调变化规律,HP为350kA·m-1时样品具有最大GMI,其值为263.5%。磁脉冲在样品内感生的横向各向异性对GMI效应产生影响,当外加直流磁场Hex等于感生磁各向异性场Hk时,GMI出现峰值。
Amorphous Co68.15Fe4.35Si12.5B15 alloy ribbons were treated by low-frequency pulsing magnetic field.Mssbauer spectroscopy and TEM observation show that initial nano-crystallization of the amorphous samples occurs,and the volume fraction of crystallized phase has a relation with pulsing magnetic field intensity.The giant magnetic impedance（GMI） of the samples were tested by a GMI instrument;the results show a non-monotonic change between GMI and pulsing magnetic field intensity HP,and the GMI reaches the greatest value of 263.5% under the magnetic field intensity HP=350 kA·m-1.The transverse anisotropy induced by pulsing magnetic field in specimens affects the GMI effect.When the external dc current magnetic filed Hex is equal to Hk,GMI reaches the peak value.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第7期1163-1167,共5页
Rare Metal Materials and Engineering
基金
高等教育博士专项基金(20020145009)
关键词
低频脉冲磁场
非晶合金纳米晶化
巨磁阻抗效应
low-frequency pulsing magnetic field
nano-crystallization of amorphous alloy
giant magnetic impedance effect
