Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 830, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154576
Keywords
Magnetic microwires; Giant magnetoimpedance; Magnetoelastic anisotropy; Magnetostriction; Annealing; Internal stresses
Categories
Funding
- Spanish MCIU [PGC2018-099530-B-C31]
- Government of the Basque Country [PIBA 2018-44]
- Russian Foundation for Basic Research [16-53-48012]
- Act 211 Government of the Russian Federation [02.A03.21.0011]
- ERDF
- ESF
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The influence of post-processing (annealing and stress-annealing) on the magnetic softness, Giant magnetoimpedance (GMI) effect and domain wall dynamics of Fe3.6Co69.2Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires is studied. As-prepared Co-rich glass-coated microwire presents linear hysteresis loops and rather higher magnetoimpedance ratio with double-peak magnetic field dependence, typical for materials with transverse magnetic anisotropy. Considerable magnetic hardening and transformation of linear hysteresis loop with low coercivity (H-c approximate to 4 A/m) into rectangular with H-c approximate to 90 A/m upon annealing without stress is observed. However, we observed remarkable MI effect improvement at certain annealing conditions. Stress-annealing of studied microwire allows considerable magnetoimpedance ratio and domain wall velocity increasing. Additionally, remanent magnetization growth and coercivity decrease are generally observed upon stress annealing. Frequency dependence of maximum GMI ratio for as-prepared and annealed samples is evaluated. The obtained frequency dependence of the maximum GMI ratio allows determination of the optimal GMI measurement conditions for each sample. The observed stressinduced anisotropy and related changes in magnetic properties are discussed considering the internal stresses relaxation and back-stresses. (C) 2020 Elsevier B.V. All rights reserved.
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