Ames Laboratory; Physics and Astronomy
Physics and Astronomy, Ames Laboratory
Physical Review Applied
We report on the synthesis of single-crystal and polycrystalline samples of Ce 3 − x Mg x Co 9 solid solution ( 0 ≤ x ≲ 1.4 ) and characterization of their structural and magnetic properties. The crystal structure remains rhombohedral in the whole composition range and Mg partially replaces Ce in the 6 c site of the CeCo 3 structure. Ferromagnetism is induced by Mg substitutions starting as low as x = 0.18 and reaching a Curie temperature as high as 450 K for x = 1.35 . Measurements on single crystals with x = 1.34 and T C = 440 K indicate an axial magnetic anisotropy with an anisotropy field of 6 T and a magnetization of 6 μ B / f . u . at 300 K. Coercicity is observed in the polycrystalline samples consistent with the observed axial magnetic anisotropy. Our discovery of ferromagnetism with large axial magnetic anisotropy induced by substituting a rare-earth element by Mg is a very promising result in the search of inexpensive permanent-magnet materials and suggests that other nonmagnetic phases, similar to CeCo 3 , may also conceal nearby ferromagnetic phases.
Department of Energy Subject Categories
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
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