The GMI effect of Fe-based microwires with a partially crystallized near-surface layer

被引：0
作者：
Fuks, A. A. [1 ,2 ]
Aksenov, O. I. [1 ]
Matveev, D. V. [1 ]
Aronin, A. S. [1 ,2 ]
机构：
[1] RAS, Osipyan Inst Solid State Phys, Chernogolovka 142432, Russia
[2] Natl Res Univ, Higher Sch Econ, Moscow, Russia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2025年 / 614卷
关键词：
Microwires; GMI; Finemet; Near-surface; Partially crystallized; Nanocrystals; GIANT MAGNETO-IMPEDANCE; GLASS-COATED MICROWIRES; INTERNAL-STRESS; MAGNETOIMPEDANCE; TENSILE;
D O I：
10.1016/j.jmmm.2024.172712
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The GMI effect was investigated in microwires based on a Fe70Si18B9Cu1Nb2 alloy (rho = d/D = 0.5, d = 15 mu m) after heat treatment at 550 degrees C resulting in the formation of a non-uniform nanocrystalline structure. It was shown experimentally that short heat treatments (<= 2 min 40 s) led to the emergence of alpha-Fe(Si) nanocrystals near the surface of a microwire while the central part of the microwire remained amorphous. Simultaneous processes of stress relaxation and formation of the nanocrystalline structure induced an enhancement of the GMI effect. A maximum value of Delta Z/Z = 150 % was observed at a frequency of 200 MHz. With an increase in the heat treatment time, the soft magnetic properties of the surface layer degenerated, resulting in the degradation of the observed GMI effect.
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页数：5
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