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

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.
Authors:
 [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [1]
  1. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT (United Kingdom)
  2. (United Kingdom)
  3. Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)
  4. Institute for Materials Research, University of Leeds, Leeds LS2 9JT (United Kingdom)
  5. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  6. (China)
  7. ISIS, Harwell Science and Innovation Campus, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX (United Kingdom)
Publication Date:
OSTI Identifier:
22300012
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; COOLING; EPITAXY; FILMS; FREEZING; IRON ALLOYS; LATTICE PARAMETERS; LAYERS; MAGNESIUM OXIDES; MELTING; MICROSTRUCTURE; PHASE TRANSFORMATIONS; RHODIUM ALLOYS; SPUTTERING; SUBSTRATES; SUPERHEATING; SYNCHROTRON RADIATION; X-RAY DIFFRACTION