Open AccessTailoring circular magnetic domain structure and high frequency magneto-impedance of melt-extracted Co69.25Fe4.25Si13B13.5 microwires through Nb doping
Author(s) -
Tatiana Eggers,
O. Thiabgoh,
Sida Jiang,
Hongxian Shen,
J. S. Liu,
Jianfei Sun,
H. Srikanth,
ManhHuong Phan
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4975134
Subject(s) - materials science , doping , surface roughness , magnetic force microscope , magnetic field , anisotropy , magnetic domain , surface finish , electrical impedance , domain wall (magnetism) , atomic force microscopy , nuclear magnetic resonance , condensed matter physics , analytical chemistry (journal) , optoelectronics , composite material , magnetization , optics , nanotechnology , chemistry , electrical engineering , physics , chromatography , quantum mechanics , engineering
The surface roughness, surface magnetic domain structure (SMDS), and high frequency magneto-impedance (MI) response of melt-extracted Co69.25Fe4.25Si13B13.5 microwires with 1 at.% Nb substitution for B have been studied by atomic force microscopy (AFM), magnetic force microscopy (MFM), and impedance analyzer, respectively. We show that the Nb doping significantly increases the domain width from 729 to 1028 nm, while preserving the low surface roughness (∼2 nm) of the base composition. As a result, a greater improvement of the high frequency MI response (∼300%/Oe at 20 MHz) is achieved in the Nb-doped microwire. A well-defined circumferential anisotropy formed with Nb-substitution is key to a highly sensitive MI field sensor
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