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Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

Coupled order parameters in phase-transition materials can be controlled using various driving forces such as temperature, magnetic and electric field, strain, spin-polarized currents and optical pulses. Tuning the material properties to achieve efficient transitions would enable fast and low-power...

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Detalles Bibliográficos
Autores principales: Uhlíř, V., Arregi, J. A., Fullerton, E. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5062592/
https://www.ncbi.nlm.nih.gov/pubmed/27725642
http://dx.doi.org/10.1038/ncomms13113
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author Uhlíř, V.
Arregi, J. A.
Fullerton, E. E.
author_facet Uhlíř, V.
Arregi, J. A.
Fullerton, E. E.
author_sort Uhlíř, V.
collection PubMed
description Coupled order parameters in phase-transition materials can be controlled using various driving forces such as temperature, magnetic and electric field, strain, spin-polarized currents and optical pulses. Tuning the material properties to achieve efficient transitions would enable fast and low-power electronic devices. Here we show that the first-order metamagnetic phase transition in FeRh films becomes strongly asymmetric in mesoscale structures. In patterned FeRh stripes we observed pronounced supercooling and an avalanche-like abrupt transition from the ferromagnetic to the antiferromagnetic phase, while the reverse transition remains nearly continuous over a broad temperature range. Although modest asymmetry signatures have been found in FeRh films, the effect is dramatically enhanced at the mesoscale. The activation volume of the antiferromagnetic phase is more than two orders of magnitude larger than typical magnetic heterogeneities observed in films. The collective behaviour upon cooling results from the role of long-range ferromagnetic exchange correlations that become important at the mesoscale and should be a general property of first-order metamagnetic phase transitions.
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spelling pubmed-50625922016-10-27 Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes Uhlíř, V. Arregi, J. A. Fullerton, E. E. Nat Commun Article Coupled order parameters in phase-transition materials can be controlled using various driving forces such as temperature, magnetic and electric field, strain, spin-polarized currents and optical pulses. Tuning the material properties to achieve efficient transitions would enable fast and low-power electronic devices. Here we show that the first-order metamagnetic phase transition in FeRh films becomes strongly asymmetric in mesoscale structures. In patterned FeRh stripes we observed pronounced supercooling and an avalanche-like abrupt transition from the ferromagnetic to the antiferromagnetic phase, while the reverse transition remains nearly continuous over a broad temperature range. Although modest asymmetry signatures have been found in FeRh films, the effect is dramatically enhanced at the mesoscale. The activation volume of the antiferromagnetic phase is more than two orders of magnitude larger than typical magnetic heterogeneities observed in films. The collective behaviour upon cooling results from the role of long-range ferromagnetic exchange correlations that become important at the mesoscale and should be a general property of first-order metamagnetic phase transitions. Nature Publishing Group 2016-10-11 /pmc/articles/PMC5062592/ /pubmed/27725642 http://dx.doi.org/10.1038/ncomms13113 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Uhlíř, V.
Arregi, J. A.
Fullerton, E. E.
Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title_full Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title_fullStr Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title_full_unstemmed Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title_short Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes
title_sort colossal magnetic phase transition asymmetry in mesoscale ferh stripes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5062592/
https://www.ncbi.nlm.nih.gov/pubmed/27725642
http://dx.doi.org/10.1038/ncomms13113
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