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Off‐diagonal magnetoimpedance in amorphous microwires for low‐field magnetic sensors
Author(s) -
Panina L. V.,
Yudanov N. A.,
Morchenko A. T.,
Kostishyn V. G.,
Makhnovskiy D. P.
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532578
Subject(s) - materials science , amorphous solid , diagonal , annealing (glass) , sensitivity (control systems) , voltage , excitation , magnetic field , anisotropy , optoelectronics , linearity , offset (computer science) , magnetoresistance , magnetic anisotropy , biasing , condensed matter physics , nuclear magnetic resonance , electronic engineering , electrical engineering , computer science , magnetization , physics , composite material , optics , engineering , chemistry , geometry , mathematics , organic chemistry , quantum mechanics , programming language
Magnetoimpedance (MI) in amorphous wires is widely used for the development of various sensors and smart composites with sensing functionalities. In the case of sensor applications, MI in off‐diagonal configuration has a number of advantages including linearity, enhanced output voltage sensitivity, efficient resonance, or differential excitation schemes. In this article, we discuss the fundamentals of the off‐diagonal MI in amorphous microwires, working principles, and design of miniature MI magnetic sensors. Considering the electrodynamic origin of MI, a comparison with orthogonal fluxgates is made with the purpose to suggest improvements in MI sensor design. This includes multi‐wire configuration and suppression of the voltage offset caused by magnetic anisotropy helicity. New results on the heating effects reveal that the temperature stability along with sensitivity may be enhanced by annealing. The paper focus is aimed to demonstrate that the off‐diagonal MI sensors have a high potential for improvements in terms of output voltage sensitivity, magnetic field resolution and temperature stability.