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Title: Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

Abstract

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. Finally, 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.

Authors:
 [1];  [2];  [3]
  1. Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; Brno Univ. of Technology, Brno (Czech Republic). CEITEC BUT
  2. Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research; Brno Univ. of Technology, Brno (Czech Republic). CEITEC BUT; CIC nanoGUNE, Tolosa Hiribidea, Donostia-San Sebastian (Spain)
  3. Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1430229
Grant/Contract Number:  
SC0003678; 16-23940Y
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Uhlir, V., Arregi, J. A., and Fullerton, E. E. Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes. United States: N. p., 2016. Web. doi:10.1038/ncomms13113.
Uhlir, V., Arregi, J. A., & Fullerton, E. E. Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes. United States. doi:10.1038/ncomms13113.
Uhlir, V., Arregi, J. A., and Fullerton, E. E. Tue . "Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes". United States. doi:10.1038/ncomms13113. https://www.osti.gov/servlets/purl/1430229.
@article{osti_1430229,
title = {Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes},
author = {Uhlir, V. and Arregi, J. A. and Fullerton, E. E.},
abstractNote = {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. Finally, 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.},
doi = {10.1038/ncomms13113},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Tue Oct 11 00:00:00 EDT 2016},
month = {Tue Oct 11 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 8 works
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Works referenced in this record:

Multiferroics progress and prospects in thin films
journal, January 2007

  • Ramesh, R.; Spaldin, Nicola A.
  • Nature Materials, Vol. 6, Issue 1, p. 21-29
  • DOI: 10.1038/nmat1805