Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 660, Issue -, Pages 297-303Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.11.102
Keywords
Nanocrystalline microwires; Glass-coated microwires; Taylor-Ulitvosky technique; Grain size; Domain wall dynamics; Heat treatment
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Funding
- MINECO [MAT2013-47231-C2-1-P]
- Russian Ministry of Education and Science under the MISIS [K3-2015-024]
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We studied magnetic properties of Fe38.5Co38.5B18Mo4Cu1 Hitperm-like glass-coated microwires obtained by Taylor-Ulitovsky technique with nanocrystalline structure consisting of about 20-30 nm BCC alpha-FeCo and an amorphous precursor in as-prepared samples. We observed a considerable decrease of the average grain size (from about 23 to 11 nm) after annealing. As-prepared and annealed Fe38.5Co38.5B18Mo4Cu1 Hitperm-like glass -coated microwires present rectangular hysteresis loops and fast domain wall propagation. We measured and analyzed the frequency dependence of the switching field dependence and domain wall dynamics in as-prepared and annealed Hitperm-type microwires. Obtained results are discussed in terms of the microstructural relaxation, grains refinement and internal stresses relaxation. An enhancement of the domain wall velocity as well as mobility after annealing has been attributed to the structural relaxation of such grains with positive magnetostriction. (C) 2015 Elsevier B.V. All rights reserved.
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