Soft Magnetic Materials 13

J. Phys. IV France 08 (1998) Pr2-111-Pr2-114
DOI: 10.1051/jp4:1998226

Influence of Ni-substitution on magnetic properties of annealed FeNiNbCuSiB alloys

P. Vojtaník¹, E. Komová¹, R. Varga¹, R. Matejko¹, R. Grössinger², H. Sassik², P. Agudo³, M. Vásquez³ and A. Hernando<sup>3

1</sup>  Department of Experimental Physics, Fac. Sci., P. J. Safárik's University, Park Angelinum 9, 04754 Kosice, Slovakia
²  Institut für Experimentalphysik, Technische Universität Wien, Wiedner Haupststr. 8-10, 1040 Wien, Austria
³  Instituto de Magnetismo Aplicado, RENFE-UCM, Instituto de Ciencia de Materiales, CSIC, P.O. BOX 155, 28230 Las Rosas, Madrid, Spain

Abstract
A set of amorphous Finemet based ribbons of the composition Fe_{73 5-x}Ni_xNb₃Cu₁Si_13-5B₉ (0 ≤ x ≤ 25) was produced bu melt spinning technique. For determining the critical temperatures DSC studies as wel as ac-susceptibility measurements were performed. Additionally pinning field and MAE (magnetic after-effect studies were made. After a heat treatment at 550°C for 1h a nanocrystalline state was formed which leads to a magnetic softening for Ni concentrations up to x=15. The first crystallization temperature at about 545 °C is nearly independent of the Ni concentration. The second crystallization stage decreases from 695°C (for x=0) to 588°C (for x=25°C).

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