Abstract
The structure and magnetic properties of ferromagnetic Tbi-xGdxFe2 system have been studied through the morphotropic phase boundary (MPB), a phase boundary between two ferroic phases of different crystal symmetry. Morphotropic phase boundary (MPB) has been studied extensively for its extraordinary enhancement effect in ferroelectrics. Based on same mechanism, we have designed a pseudobinary ferromagnetic system Tb1-xGdxFe2, of which the near-MPB composition Tb1-xGdxFe2 shows maximum magnetization under small field, and meanwhile dramatically the low magnetostriction. With synchrotron x-ray diffractometry, the crystal structure of TbFe2-rich compositions is detected to be rhombohedral and that of GdFe2-rich compositions is tetragonal below their curie temperatures. The near MPB composition Tb0.1Gd0.9Fe2, shows the maximum magnetization among all available compositions and superposition of magnetostriction behavior of R and T phases. To find MPB phenomena in ferromagnets may provide a new route to design functional materials in other ferroic MPB systems.
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