日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 12 (1990),
pp. 1414-1421

Magnetic Properties of (Fe-Co)m(Pr, Sm)n (m/n=17/2, 5/1, 7/2) Compounds Prepared by Rapid Quenching Technique

Terunobu Miyazaki1, Mikio Takahashi2, Shunji Ishio1 and Migaku Takahashi1

1Faculty of Engineering, Tohoku University, Sendai
2Graduate Student, Tohoku University, Sendai

Abstract:

Coercivity, magnetization, Curie temperature and maximum energy product of rapidly quenched (Fe1-xCox)1-y(Sm, Pr)y (0≤x≤1.0; y=0.11, 0.17 and 0.22) alloys were measured. The coercivity at room temperature is: 480-1120 kA/m for (Fe1-xCox)0.83Sm0.17 (CaCu5 type, 0.6≤x≤1.0), 240-480 kA/m for (Fe1-xCox)0.83Pr0.17 (CaCu5 type, 0.6≤x≤1.0), 240-500 kA/m for (Fe1-xCox)0.78Pr0.22 (Gd2Co7 type, 0.6≤x≤1.0), 64-160 kA/m for (Fe1-xCox)0.89Pr0.11 (TbCu7 type, 0≤x≤0.6), and 4-64 kA/m for (Fe1-xCox)0.89Pr0.11 (TbCu7 type, 0≤x≤1.0).
The magnetic anisotropy and coercivity of the alloys are discussed on the basis of the single ion model. The composition dependence of coercivity in the (Fe-Co)0.83Sm0.17 and (Fe-Co)0.89Sm0.11 alloys are attributed to the change of both lattice constant and molecular field.


(Received 1990/4/20)

Keywords:

compounds, rapid-quenching technique, rare earth, coercivity, maximum energy product, single ion model


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