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Magnetic exchange interactions in RxFe80-xB20 amorphous alloys based on Sm and Gd

N. SULIŢANU1,* , F. BRÎNZĂ1, V. NICA1

Affiliation

  1. Department of Physics, Faculty of Physics, “Al.I.Cuza” University 11 Carol I Blvd., 700506 Iasi, Romania

Abstract

Amorphous RxFe80-xB20 alloys (with R = Sm and Gd), in ribbon form, have been prepared by melt spinning and their magnetic properties have been studied (0 ≤ x ≤ 18). The mean field theory has been used to explain the temperature dependence of the magnetization. The Fe moment, the R moment, the Curie temperature and the exchange interactions between Fe-Fe and Fe-R atom pairs have been evaluated. The Sm moment at 4.2 K is found to be 0.73 μBP which is two times smaller than the theoretical value of 1.5 μBP indicating a conical spin structure. On the other hand, the Gd moment at 4.2 K is found to be 6.85 μBP which agree with the theoretical value indicating a collinear spin structure. The increase of FeR interaction with an increase of R content is attributed to an enhancement of the 3d-5d band hybridization..

Keywords

Iron base alloys, Ternary alloys, Samarium alloy, Gadolinium alloys, Magnetism, Exchange interactions.

Submitted at: Nov. 7, 2008
Accepted at: Dec. 10, 2008

Citation

N. SULIŢANU, F. BRÎNZĂ, V. NICA, Magnetic exchange interactions in RxFe80-xB20 amorphous alloys based on Sm and Gd, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3497-3500 (2008)