Magnetic microwires with unique combination of magnetic properties suitable for various magnetic sensor applications
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Corte León, Paula; Zhukova Zhukova, Valentina; Chizhik, Alexander; Blanco Aranguren, Juan María; Ipatov, Mihail; González Legarreta, Lorena; Zhukov Egorova, Arkady PavlovichFecha
2020-12-16Derechos
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
Publicado en
Sensors, 2020, 20(24), 7203
Editorial
MDPI
Palabras clave
Magnetic microwires
Magnetic sensors
Giant magnetoimpedance
Domain wall propagation
Magnetostriction coefficient
Post-processing
Magnetic anisotropy
Resumen/Abstract
There is a pressing demand to improve the performance of cost-effective soft magnetic materials for use in high performance sensors and devices. Giant Magneto-impedance effect (GMI), or fast single domain wall (DW) propagation can be observed in properly processed magnetic microwires. In this paper we have identified the routes to obtain microwires with unique combination of magnetic properties allowing observation of fast and single DW propagation and GMI effect in the same microwire. By modifying the annealing conditions, we have found the appropriate regimes allowing achievement of the highest GMI ratio and the fastest DW dynamics. The observed experimental results are discussed considering the radial distribution of magnetic anisotropy and the correlation of GMI effect, and DW dynamics with bulk and surface magnetization processes. Studies of both Fe- and Co-rich microwires, using the magneto-optical Kerr effect, MOKE, provide information on the magnetic structure in the outer shell of microwires. We have demonstrated the existence of the spiral helical structure in both studied microwires. At the same time, torsion mechanical stresses induce helical bistability in the same microwires, which allow us to consider these microwires as materials suitable for sensors based on the large Barkhausen jump.
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