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Boron content dependance of magnetoimpedance in Fe91−xZr5BxNb4 alloys |
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| Authors: | K Zhang B Yao D Wang |
| Institution: | a Department of Physics, Jilin University, No. 2519, Jiefang Road, Changchun, Jilin 130023, PR China b Center for Condensed-Matter Science and Technology, Harbin University of Technology, Harbin 150001, PR China c Key Laboratory of Excited State Process, Chinese Academy of Sciences, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, PR China |
| Abstract: | A systematic investigation of the influence of B content on the magnetoimpedance (MI) effect in melt-spun Fe91−xZr5BxNb4 (FZBN, 0 ? x ? 30) ribbons has been performed within a frequency range, f ∼ 310-1110 kHz and under a varying dc magnetic field (Hdc) up to 70 Oe. The MI effect is not observed in the sample with x ? 5 but within the range 8 ? x ? 30. A distinct MI effect has been observed with a maximum change of 180% at around 1.1 MHz in the sample with x = 20, coincident with a saturation magnetic field of 66 Oe and a field sensitivity of about 7%/Oe. Magnetic measurements reveal that the MI effect and B content dependence of the effect are closely related to coercivity of the FZBN alloy series, except for the sample with 20 at.%. The drastic MI ratio observed in the sample with x = 20 is ascribed to its special microstructure. The mechanism of the MI effect in FZBN alloys and of the significant MI value appearing at a B content of x = 20 is discussed in this paper. |
| Keywords: | 61 43 Dq 71 23 Cq 75 47 Np 75 50 Ss |
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