Title :
Analysis of temperature-dependent magnetization in Sm-Fe-C compounds using a two-sublattice model
Author_Institution :
Dept. of Phys., Tsinghua Univ., Beijing, China
fDate :
5/1/1991 12:00:00 AM
Abstract :
The temperature dependence of magnetization in Sm3Fe 20Cx (x =0.3, 0.6, 0.8) and Sm2Fe16.5C1.0 intermetallic compounds with rhombohedral structure has been analyzed using molecular field theory. On the basis of a two-sublattice model, the molecular field coefficients are calculated using a numerical fitting method. The Curie temperature and the Fe-Fe, Sm-Fe, Sm-Sm magnetic interaction energies for the compounds are determined from these coefficients. The results show that the increase of the Curie temperature (Tc) with the increase of carbon content x is attributed mainly to the enhancement of the Fe-Fe exchange interaction energy caused by carbon atoms added
Keywords :
Curie temperature; exchange interactions (electron); ferromagnetic properties of substances; iron alloys; magnetic moments; magnetisation; samarium alloys; 300 to 600 K; Curie temperature; Sm2Fe16.5C1.0; Sm3Fe20Cx; exchange interaction energy; magnetic interaction energies; magnetization; molecular field coefficients; rhombohedral structure; temperature dependence; two-sublattice model; Elementary particle exchange interactions; Equations; Intermetallic; Iron; Lead; Magnetic analysis; Magnetic properties; Magnetization; Temperature dependence; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
