Abstract
R 2(Fe, Co) 14B compounds (R = Y, Nd and Gd) were prepared in high purity. The magnetic behavior of R 2(Fe, Co) 14B compounds is reported over the temperature range 4 to 300 K. The effects of Fe substitution by Co on the saturation magnetization, Curie temperature and anisotropy are presented. The spin-reorientation temperature is lowered as Co replaces Fe. This also results in a reduced cone angle. The R 2Fe 14− x Co x B alloys crystallize in the tetragonal structure over the entire concentration range of 0 ⩽ x ⩽ 14. When Fe is substituted by Co, the Curie temperature increases significantly, the saturation magnetization increases to a maximum value around x = 2, and the anisotropy becomes planar for R = Y and Gd. The Nd 2(Fe, Co) 14B systems all exhibit uniaxial anisotropy at room temperature and Nd 2Co 14B is strongly uniaxial at 77 K. The Nd 2(Fe, Co) 14B systems are conical at 77 K.
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