Analysis of temperature-dependent magnetization in Sm-Fe-C compounds using a two-sublattice model

Author

Zhihui, Liu

Author_Institution

Dept. of Phys., Tsinghua Univ., Beijing, China

Volume

27

Issue

3

fYear

1991

fDate

5/1/1991 12:00:00 AM

Firstpage

3409

Lastpage

3411

Abstract

The temperature dependence of magnetization in Sm₃Fe ₂₀C_x (x =0.3, 0.6, 0.8) and Sm₂Fe_16.5C_1.0 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 (T_c) 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; Sm₂Fe_16.5C_1.0; Sm₃Fe₂₀C_x; 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.79081

Filename

79081