中国物理B ›› 1999, Vol. 8 ›› Issue (3): 208-215.doi: 10.1088/1004-423X/8/3/008
何开元1, 刘宜华2, 胡季帆2, 郭慧群3, 沈保根3, 何峻4
He Jun (何峻)ab, Guo Hui-qun (郭慧群)a, Shen Bao-gen (沈保根)a, He Kai-yuan (何开元)b, Liu Yi-hua (刘宜华)c, Hu Ji-fan (胡季帆)c
摘要: The microstructure, magnetic properties and the giant magneto-impedance (GMI) effect of the nanocrystalline (Fe1-xCox)84Zr3.5Nb3.5B8Cu1 ribbons have been studied. With increasing Co concentration, the nanocrystallized grain size and volume fraction of the α-Fe(Co) phase decrease under the same annealing condition, while the coercivity Hc increases from 1.92 A/m at x=0.0 to 30.38 A/m at x=0.8. The effective permeability drops sharply with increasing Co concentration so that the GMI effect goes down. A value of more than 380% for the magneto-impedance(MI) ratio was measured at frequency f=2.5 MHz and the sensitivity can reach 0.9% (A/m)-1 for Fe84Zr3.5Nb3.5B8Cu1 ribbon. When x is equal to 0.8, the MI ratio drops to about 30% and the sensitivity only reaches a value of lower than 0.025% (A/m)-1. The concise analysis in theory is also expounded.
中图分类号: (Giant magnetoresistance)