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Amorphous samples of Vitrovac(R) 6025 metallic alloys were nanocrystallized by thermal annealing at temperatures in the range 576-716 K, well below the crystallization temperature (831 K, as obtained by differential scanning calorimetry at 20 K/min) and times in the range 10-90 min. Initial magnetic permeability exhibited a maximum of - 109 000 (from approximately 20 000 for the as-quenched state) for annealing times of approximately 15 min, and then a decrease toward a plateau value (30 000-40 000) for longer times. Domain wall relaxation frequency showed the opposite behavior, a minimum of approximately 9 kHz (from 40 kHz for the as-quenched value) for the permeability maximum, and then a stabilization at approximately 15 kHz. Transmission electron microscopy observations confirmed that for annealing times up to 60 min., crystallite size is smaller than 30 nm. Permeability and relaxation frequency results are interpreted in terms of the dependence of wall bulging on anisotropy and free-wall surface area between pinning sites.



Original languageEnglish
Pages (from-to)6940-6942
Number of pages3
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 15 May 1994
Event38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) - MINNEAPOLIS, Mongolia
Duration: 15 Nov 199318 Nov 1993

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