R. Sato Turtelli, D. Triyono, G. Badurek, M. Schönhart, R. Grössinger, C. Dewhurst, H. Sassik, C. Bormio-Nunes:
"Magnetic and structural properties of Joule-heated Fe73Al5Ga2P11-xC5B4Six amorphous thick ribbons";
Journal of Magnetism and Magnetic Materials,
Magnetic and structural properties of Joule-heated Fe73Al5Ga2P11−xC5B4Six amorphous thick ribbons
R. Sato TurtelliCorresponding Author Contact Information, E-mail The Corresponding Author, a, D. Triyonob, G. Badurekc, M. Schönharta, R. Grössingera, C. D. Dewhurstd, H. Sassika and C. Bormio-Nunesa
a Institut für Festkörperphysik, TU Wien, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
b Department Fisika-FMIPA, Universitas Indonesia, Depok 16424, Indonesia
c Atominstitut, TU-Wien, Wiedner Hauptstraße 8, A-1040, Vienna, Austria
d Institute Laue-Langevin, 6 rue Jules Horowitz, F-38042, Grenoble, France
Received 8 April 2004. Available online 14 July 2004.
The effect of Joule heating on the magnetic properties and microstructure was investigated in Fe73Al5Ga2P11−xC5B4Six (x=1, 3) ribbons with a thickness of about 40 small mu, Greekm. It turns out that, in these alloys, the coercive field, the pinning field and the time dependence of the initial permeability decrease with increasing current density applied during a thermal treatment via Joule heating up to the occurrence of crystallization. At the as-cast state, the sample with x=3 exhibits better soft magnetic properties than those of the sample with x=1; however, after an optimum annealing, both alloys present similar magnetic properties. The temperature dependence of the resistivity shows clear two stages crystallization process for the Fe73Al5Ga2P8C5B4Si3 alloy. The microstructural and magnetic inhomogeneities of the annealed Fe73Al5Ga2P8C5B4Si3 alloy with lowest coercivity were investigated by means of a small-angle neutron scattering method. The improvement of the soft magnetic properties caused by Joule heating of materials is due to the internal stress relieve originated during the production of the ribbon and to the enlargement of the domain wall thickness, consequently the reduction of the anisotropy.
Author Keywords: Amorphous soft magnetic materials; Small-angle neutron scattering; Joule heating; Coercive field; Pinning field; Disaccommodation
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