Abstract
Magnetization measurements on Gd 2Fe 14B single crystals show that the Fe anisotropy favors the c-axis of the tetragonal structure, as in Y 2Fe 14B. The exchange interactions between Gd and Fe spins are deduced from the temperature dependence of the Gd magnetization. A Mössbauer study with 155Gd shows the main axis of the electric field gradient to have different directions at the two rare-earth sites. Scaling the values obtained in Gd 2Fe 14 B yields values of exchange interactions between Nd and Fe spins (∼ 400 K) and of 2 nd order crystal-field parameters acting on Nd ions (∼ 300 K) in isomorphous Nd 2Fe 14B.
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