摘要
利用真空甩带机制备了Fe84Zr2.08Nb1.92Cu1B11金属快淬薄带。X射线衍射结果表明:薄带经570℃退火后析出纳米化结构bcca-Fe相,晶粒大小约为20nm^40nm,利用HP4294A阻抗分析仪测量了此纳米晶薄带中的巨磁阻抗效应。结果显示在低频下阻抗随外磁场单调减小,这主要是由于磁导率随外磁场的变化导致的,高频下阻抗随外磁场变化出现1个峰值,这主要是由于横向各向异性的原因。运用计算机模拟了这一结果,发现磁导率随外磁场的变化在外场与各向异性场的比值约为0.9处出现了峰值,巨磁阻抗效应也在此位置出现峰值。并且随着驱动电流频率的增大峰值变大。
The giant magneto-impedance effect of Fe84Zr2.08Nb1.92Cu1B11 ribbons was investigated. The ribbon Fe84Zr2.08Nb1.92Cu1B11 was prepared by melt-spun with a Cu roller speed of 40 m/s. The result of X- ray diffraction shows that the ribbons after being annealed at 570degreesC for 20 min precipitates bcc a-Fe phase with grain size of 20 nmsimilar to40 nm. The magnetoimpedance effect was measured by a HP4194A impedance analyzer at room temperature. The impedance decreases with magnetic field monotonically at low frequency due to the decrease of permeability. At high frequency, the impedance shows a peak, which is due to the transverse anisotropy. Results of model-simulation show that when the ratio of magnetic field to transverse anisotropy field reaches about 0.9. the transverse permeability as well as the impedance undergoes. a peak respectively. For frequencies range of f less than or equal to 10 MHz, the impedance peak-value increases with the increase of frequency.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第1期120-123,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助(资助号50271036)
关键词
纳米晶薄带
巨磁阻抗效应
磁导率
nanocrystalline ribbon
giant magnetoimpedance
permeability
