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The structure and properties of the ferromagnet Tb_{1-x}Dy_xFe_2 (Terfenol-D)are explored through the morphotropic phase boundary (MPB) separating ferroicphases of differing symmetry. Our synchrotron data support a first orderstructural transition, with a broadening MPB width at higher temperatures. Theoptimal point for magnetomechanical applications is not centered on the MPB butlies on the rhombohedral side, where the high striction of the rhombohedralmajority phase combines with the softened anisotropy of the MPB. We compare ourfindings with single ion crystal field theory and with ferroelectric MPBs,where the controlling energies are different.

Morphotropic Phase Boundaries in Ferromagnets: Tb_{1-x}Dy_xFe_2 Alloys