Morphotropic phase boundaries in ferromagnets: Tb1-xDyxFe2 alloys

Richard Bergstrom, Manfred Wuttig, James Cullen, Peter Zavalij, Robert Briber, Cindi Dennis, V. Ovidiu Garlea, Mark Laver

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Abstract

The structure and properties of the ferromagnet Tb1-xDyxFe2 are explored through the morphotropic phase boundary (MPB) separating ferroic phases of differing symmetry. Our synchrotron data support a first order structural transition, with a broadening MPB width at higher temperatures. The optimal point for magnetomechanical applications is not centered on the MPB but lies on the rhombohedral side, where the high striction of the rhombohedral majority phase combines with the softened anisotropy of the MPB. We compare our findings with single ion crystal field theory and with ferroelectric MPBs, where the controlling energies are different.

Original languageEnglish
JournalPhysical Review Letters
Volume111
Issue number1
Pages (from-to)017203
ISSN0031-9007
DOIs
Publication statusPublished - 2013
Externally publishedYes

Bibliographical note

© 2013 American Physical Society

Keywords

  • Ferromagnetic materials
  • Ferromagnetism
  • Magnets
  • Cerium alloys

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