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Title: Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands

Abstract

The antiferromagnetic-to-ferromagnetic phase transition in B2-ordered FeRh is imaged in laterally confined nanopatterned islands using photoemission electron microscopy with x-ray magnetic circular dichroism contrast. The resulting magnetic images directly detail the progression in the shape and size of the FM phase domains during heating and cooling through the transition. In 5-μm-square islands this domain development during heating is shown to proceed in three distinct modes - nucleation, growth, and merging - each with subsequently greater energy costs. In 0.5-μm islands, which are smaller than the typical final domain size, the growth mode is stunted and the transition temperature is found to be reduced by 20 K. The modification to the transition temperature is found by high-resolution scanning transmission electron microscopy to be due to a 100-nm chemically disordered edge grain present as a result of ion implantation damage during the patterning. FeRh has unique possibilities for magnetic memory applications; the inevitable changes to its magnetic properties due to subtractive nanofabrication will need to be addressed in future work in order to progress from sheet films to suitable patterned devices.

Authors:
 [1];  [2];  [1];  [2];  [2];  [1];  [3]; ;  [2];  [2];  [1];  [1]
+ Show Author Affiliations
  1. Univ. of Leeds, Leeds (United Kingdom)
  2. Univ. of Glasgow, Scotland (United Kingdom)
  3. Harwell Science and Innovation Campus, Didcot (United Kingdom)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1582327
Grant/Contract Number:  
AC02-05CH11231; EP-M018504-1; EP-M019020-1
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 10; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Domains; Magnetic phase transitions; Physical Systems; Nanostructures; Techniques; Scanning transmission electron microscopy; X-ray photoemission electron microscopy

Citation Formats

Temple, R. C., Almeida, T. P., Massey, J. R., Fallon, K., Lamb, R., Morley, S. A., Maccherozzi, F., Dhesi, S. S., McGrouther, D., McVitie, S., Moore, T. A., and Marrows, C. H. Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands. United States: N. p., 2018. Web. doi:10.1103/physrevmaterials.2.104406.
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Temple, R. C., Almeida, T. P., Massey, J. R., Fallon, K., Lamb, R., Morley, S. A., Maccherozzi, F., Dhesi, S. S., McGrouther, D., McVitie, S., Moore, T. A., & Marrows, C. H. Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands. United States. https://doi.org/10.1103/physrevmaterials.2.104406
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Temple, R. C., Almeida, T. P., Massey, J. R., Fallon, K., Lamb, R., Morley, S. A., Maccherozzi, F., Dhesi, S. S., McGrouther, D., McVitie, S., Moore, T. A., and Marrows, C. H. Mon . "Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands". United States. https://doi.org/10.1103/physrevmaterials.2.104406. https://www.osti.gov/servlets/purl/1582327.
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@article{osti_1582327,
title = {Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands},
author = {Temple, R. C. and Almeida, T. P. and Massey, J. R. and Fallon, K. and Lamb, R. and Morley, S. A. and Maccherozzi, F. and Dhesi, S. S. and McGrouther, D. and McVitie, S. and Moore, T. A. and Marrows, C. H.},
abstractNote = {The antiferromagnetic-to-ferromagnetic phase transition in B2-ordered FeRh is imaged in laterally confined nanopatterned islands using photoemission electron microscopy with x-ray magnetic circular dichroism contrast. The resulting magnetic images directly detail the progression in the shape and size of the FM phase domains during heating and cooling through the transition. In 5-μm-square islands this domain development during heating is shown to proceed in three distinct modes - nucleation, growth, and merging - each with subsequently greater energy costs. In 0.5-μm islands, which are smaller than the typical final domain size, the growth mode is stunted and the transition temperature is found to be reduced by 20 K. The modification to the transition temperature is found by high-resolution scanning transmission electron microscopy to be due to a 100-nm chemically disordered edge grain present as a result of ion implantation damage during the patterning. FeRh has unique possibilities for magnetic memory applications; the inevitable changes to its magnetic properties due to subtractive nanofabrication will need to be addressed in future work in order to progress from sheet films to suitable patterned devices.},
doi = {10.1103/physrevmaterials.2.104406},
journal = {Physical Review Materials},
number = 10,
volume = 2,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2018},
month = {Mon Oct 01 00:00:00 EDT 2018}
}
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https://doi.org/10.1103/physrevmaterials.2.104406
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    Works referencing / citing this record:

    Phase boundary exchange coupling in the mixed magnetic phase regime of a Pd-doped FeRh epilayer
    journal, February 2020

    Spectral reflectivity crossover at the metamagnetic transition in FeRh thin films
    journal, January 2019

    • Bennett, S. P.; Currie, M.; van ’t Erve, O. M. J.
    • Optical Materials Express, Vol. 9, Issue 7
    • DOI: 10.1364/ome.9.002870
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