Specific features of magnetic properties of 'thick' microwires produced by the Ulitovsky-Taylor method
| Autor: | Alexander N. Shalygin, Elena E. Shalygina, V. V. Samsonova, V. V. Molokanov, P. P. Umnov, A. A. Rozhnovskaya, N. V. Umnova |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Solid-state physics Annealing (metallurgy) Analytical chemistry Coercivity Condensed Matter Physics Electronic Optical and Magnetic Materials Amorphous solid law.invention Metal Nuclear magnetic resonance law visual_art visual_art.visual_art_medium Crystallization Saturation (magnetic) Order of magnitude |
| Zdroj: | Physics of the Solid State. 54:287-292 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | The magnetic properties of initial and heat-treated Co69Fe4Cr4Si12B11 microwires in a glass shell with the diameter D = 125 μm and the diameter of the amorphous metallic core d = 90 μm produced by the Ulitovsky-Taylor method have been studied. It has been found that the magnetic characteristics, in particular, the saturation field HS and the coercive force HC of the samples annealed at a temperature T < 300°C do not differ from HS and HC of the initial microwire, and those of the samples annealed at T ≥ 400°C increase by almost one order of magnitude. The obtained experimental data have been explained by the structural features of the microwires. The near-surface values of HS and HC at T < 300°C are found to be larger than the bulk values by a factor of 5–10. These experimental data have been explained by the existence of structural and chemical ingomogeneities in the near-surface layer, which are inherent in amorphous materials. This difference decreases with a further increase in the annealing temperature, but HS and HC increase substantially. This fact has been explained by the beginning of the microwire crystallization. |
| Databáze: | OpenAIRE |
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