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Critical magnetic field and structural relaxation in Metglas ribbons

✍ Scribed by G. Hernández-Jiménez; R. Valenzuela

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
245 KB
Volume
10
Category
Article
ISSN
0921-5107

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✦ Synopsis

Initial magnetization curves of Metglas 2605 SC ferromagnetic amorphous ribbons were obtained as a function of temperature and elapsed time of each temperature in the temperature range 373-473 K and for times up to 60 min. For each temperature the critical magnetic field obtained from these magnetization curves showed an increase as a function of time, eventually reaching a stable value. The initial permeability showed a decrease with similar characteristics. These results are interpreted on the basis of structural relaxation of the amorphous ribbons.

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Critical current densities have been inferred from magnetic hysteresis and volume pinning energies from magnetic relaxation measurements for neutron irradiated and unirradiated polycrystalline Y123 samples. Increases in the critical current densities, by factors of 2-3 in zero field and larger in a