THE INFLUENCE OF Co SUBSTITUTION ON THE MAGNETIC PROPERTIES AND THE GIANT MAGNETO-IMPEDANCE EFFECT OF (Fe1-xCox)84Zr3.5Nb3.5B8Cu1
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
a State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Material Science and Engineering, Northeastern University, Shenyang 110006, China; c Department of Physics, Shandong University, Jinan 250100, China
Abstract 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 $\alpha$-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.
Received: 16 July 1998
Accepted manuscript online:
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project Supported by the National Natural Science Foundation of China (Grant No. 59671011 and 59525101), Partially by the Research Item of Science Commission of Shandong Province, China, and by the State Key Laboratory of Magnetism, Institute of Physics,
Cite this article:
He Jun (何峻), Guo Hui-qun (郭慧群), Shen Bao-gen (沈保根), He Kai-yuan (何开元), Liu Yi-hua (刘宜华), Hu Ji-fan (胡季帆) THE INFLUENCE OF Co SUBSTITUTION ON THE MAGNETIC PROPERTIES AND THE GIANT MAGNETO-IMPEDANCE EFFECT OF (Fe1-xCox)84Zr3.5Nb3.5B8Cu1 1999 Acta Physica Sinica (Overseas Edition) 8 208
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