Asymmetric “melting” and “freezing” kinetics of the magnetostructural phase transition in B2-ordered FeRh epilayers

M. A. De Vries, M. Loving, M. Mclaren, R. M. D. Brydson, X. Liu, S. Langridge, L. H. Lewis, C. H. Marrows

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Synchrotron X-ray diffraction was used to study the phase transformation processes during the magnetostructural transition in a B2-ordered FeRh (001)-oriented epilayer grown on MgO by sputtering. Out-of-plane lattice constant measurements within the hysteretic regime of the transition reveal a microstructure consistent with the coexistence of lattice-expanded and contracted phases in spatially distinct regions. It was found that the phase separation is more pronounced during cooling than heating. Furthermore, whilst lattice-expanded domains that span the height of the film can be undercooled by several kelvins, there is no equivalent superheating. This asymmetry between the cooling and heating processes in FeRh is consistent with the difference in the kinetics of generic freezing and melting transitions.
Original languageEnglish
Article number232407
JournalApplied Physics Letters
Volume104
Issue number23
Early online date28 May 2014
DOIs
Publication statusPublished - 9 Jun 2014

Keywords / Materials (for Non-textual outputs)

  • lattice constants
  • Curie point
  • melting
  • surface phase transitions
  • ferromagnetism

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