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Title: Asymmetric ¿Melting¿ and ¿Freezing¿ Kinetics of the Magnetostructural Phase Transition in B2-ordered FeRh Epilayers

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1162451
Report Number(s):
BNL-106395-2014-JA
Journal ID: ISSN 0003--6951
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23
Country of Publication:
United States
Language:
English

Citation Formats

de Vries, M., Loving, M., McLaren, M., Brydson, R., Liu, X., Langridge, S., Lewis, L., and Marrows, C. Asymmetric ¿Melting¿ and ¿Freezing¿ Kinetics of the Magnetostructural Phase Transition in B2-ordered FeRh Epilayers. United States: N. p., 2014. Web. doi:10.1063/1.4883369.
de Vries, M., Loving, M., McLaren, M., Brydson, R., Liu, X., Langridge, S., Lewis, L., & Marrows, C. Asymmetric ¿Melting¿ and ¿Freezing¿ Kinetics of the Magnetostructural Phase Transition in B2-ordered FeRh Epilayers. United States. doi:10.1063/1.4883369.
de Vries, M., Loving, M., McLaren, M., Brydson, R., Liu, X., Langridge, S., Lewis, L., and Marrows, C. Mon . "Asymmetric ¿Melting¿ and ¿Freezing¿ Kinetics of the Magnetostructural Phase Transition in B2-ordered FeRh Epilayers". United States. doi:10.1063/1.4883369.
@article{osti_1162451,
title = {Asymmetric ¿Melting¿ and ¿Freezing¿ Kinetics of the Magnetostructural Phase Transition in B2-ordered FeRh Epilayers},
author = {de Vries, M. and Loving, M. and McLaren, M. and Brydson, R. and Liu, X. and Langridge, S. and Lewis, L. and Marrows, C.},
abstractNote = {},
doi = {10.1063/1.4883369},
journal = {Applied Physics Letters},
number = 23,
volume = 104,
place = {United States},
year = {Mon Jun 09 00:00:00 EDT 2014},
month = {Mon Jun 09 00:00:00 EDT 2014}
}
  • 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 ismore » consistent with the difference in the kinetics of generic freezing and melting transitions.« less
  • In materials where two or more ordering degrees of freedom are closely matched in their free energies, coupling between them, or multiferroic behavior can occur. These phenomena can produce a very rich phase behavior, as well as emergent phases that offer useful properties and opportunities to reveal novel phenomena in phase transitions. The ordered alloy FeRh undergoes an antiferromagnetic to ferromagnetic phase transition at ~375 K, which illustrates the interplay between structural and magnetic order mediated by a delicate energy balance between two configurations. We have examined this transition using a combination of high-resolution x-ray structural and magnetic imaging andmore » comprehensive x-ray magnetic circular dichroism spectroscopy. We find that the transition proceeds via a defect-driven domain nucleation and growth mechanism, with significant return point memory in both the structural and magnetic domain configurations. In conclusion, the domains show evidence of inhibited growth after nucleation, resulting in a quasi- 2nd order temperature behavior.« less
  • Surface structural effects accompanying the antiferromagnetic-ferromagnetic magnetostructral transition of epitaxial FeRh thin films were investigated by grazing incidence x-ray scattering. Measurement of the film lattice parameters and variation of x-ray incident angles allow observation of the transition character on scales ranging from a few nm to the total through-thickness of the film. Out-of-plane lattice measurements confirm that the ferromagnetic phase nucleates from the surface during the heating process and is retained at the surface below the transition temperature during the cooling process. These results suggest that surface strain relief fosters nucleation of the ferromagnetic phase.