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Modelling and measurement of magnetically soft nanowire arrays for sensor applications
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SYSNO ASEP 0541691 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Modelling and measurement of magnetically soft nanowire arrays for sensor applications Author(s) Ripka, P. (CZ)
Grim, V. (CZ)
Mirzaei, M. (CZ)
Hraková, D. (CZ)
Uhrig, J. (DE)
Emmerich, F. (DE)
Thielemann, C. (DE)
Hejtmánek, Jiří (FZU-D) RID, ORCID
Kaman, Ondřej (FZU-D) RID, ORCID
Tesař, Roman (FZU-D) RID, ORCIDNumber of authors 10 Article number 3 Source Title Sensors. - : MDPI
Roč. 21, č. 1 (2021)Number of pages 17 s. Language eng - English Country CH - Switzerland Keywords magnetic nanowires ; soft magnetic wires ; magnetic sensors Subject RIV JJ - Other Materials OECD category Nano-materials (production and properties) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000606671000001 EID SCOPUS 85098529616 DOI 10.3390/s21010003 Annotation Soft magnetic wires and microwires are currently used for the cores of magnetic sensors. Due to their low demagnetization, they contribute to the high sensitivity and the high spatial resolution of fluxgates, Giant Magnetoimpedance (GMI), and inductive sensors. The arrays of nanowires can be prepared by electrodeposition into predefined pores of a nanoporous polycarbonate membrane. While high coercivity arrays with square loops are convenient for information storage and for bistable sensors such as proximity switches, low coercivity cores are needed for linear sensors. We show that coercivity can be controlled by the geometry of the array: increasing the diameter of nanowires (20 µm in length) from 30 nm to 200 nm reduced the coercivity by a factor of 10, while the corresponding decrease in the apparent permeability was only 5-fold. Finite element simulation of nanowire arrays is important for sensor development, but it is computationally demanding. While an array of 2000 wires can be still modelled in 3D, this is impossible for real arrays containing millions of wires. We have developed an equivalent 2D model, which allows us to solve these large arrays with acceptable accuracy.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0319222
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