Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4883369
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Funding
- National Science Foundation [DMR-0908767]
- UK Engineering and Physical Sciences Research Council [EP/G065640/1]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Engineering and Physical Sciences Research Council [EP/G065640/1] Funding Source: researchfish
- EPSRC [EP/G065640/1] Funding Source: UKRI
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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. (C) 2014 AIP Publishing LLC.
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