Annealing influence on the magnetostructural transition in Gd5Si1.3Ge2.7 thin films
Abstract
Due to the emerging cooling possibilities at the micro and nanoscale, such as the fast heat exchange rate, the effort to synthesize and optimize the magnetocaloric materials at these scales is rapidly growing. Here, we report the effect of different thermal treatments on Gd5Si1.3Ge2.7 thin film in order to evaluate the correlation between the crystal structure, magnetic phase transition and magnetocaloric effect. For annealing temperatures higher than 500ºC, the samples showed a typical paramagnetic behavior. On the other hand, thermal treatments below 500ºC promoted the suppression of the magnetostructural transition at 190 K, while the magnetic transition around 249 K is not affected. This magnetostructural transition extinction was reflected in the magnetocaloric behavior and resulted in a drastic decrease in the entropy change peak value (of about 68%). An increase in TC was reported, proving that at the nanoscale, heat treatments may be a useful tool to optimize the magnetocaloric properties in Gd5(SixGe1-x)4 thin films.
- Authors:
-
- Centro de Fisica Nuclear da Univ. de Lisboa, Lisboa (Portugal); Departamento de Fisica e Astronomia da Faculdade de Ciencias da Univ. do Porto, Porto (Portugal)
- Departamento de Fisica e Astronomia da Faculdade de Ciencias da Univ. do Porto, Porto (Portugal)
- Iowa State Univ., Ames, IA (United States)
- Univ. de Tras-os-Montes e Alto Douro, VilaReal (Portugal)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE
- OSTI Identifier:
- 1227309
- Alternate Identifier(s):
- OSTI ID: 1245677
- Report Number(s):
- IS-J-8833
Journal ID: ISSN 0167-577X; PII: S0167577X15007429
- Grant/Contract Number:
- PTDC/CTM-NAN/115125/2009; EXPL/EMS-ENE/2315/2013; FEDER/POCTIn0155/94; SFRH/BD/88440/2012; AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Letters
- Additional Journal Information:
- Journal Volume: 159; Journal Issue: C; Journal ID: ISSN 0167-577X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; magnetocaloric thin films; thermal treatment; magnetocaloric effect
Citation Formats
Pires, A. L., Belo, J. H., Gomes, I. T., Hadimani, R. L., Jiles, D. C., Fernandes, L., Tavares, P. B., Araújo, J. P., Lopes, A. M. L., and Pereira, A. M. Annealing influence on the magnetostructural transition in Gd5Si1.3Ge2.7 thin films. United States: N. p., 2015.
Web. doi:10.1016/j.matlet.2015.05.029.
Pires, A. L., Belo, J. H., Gomes, I. T., Hadimani, R. L., Jiles, D. C., Fernandes, L., Tavares, P. B., Araújo, J. P., Lopes, A. M. L., & Pereira, A. M. Annealing influence on the magnetostructural transition in Gd5Si1.3Ge2.7 thin films. United States. https://doi.org/10.1016/j.matlet.2015.05.029
Pires, A. L., Belo, J. H., Gomes, I. T., Hadimani, R. L., Jiles, D. C., Fernandes, L., Tavares, P. B., Araújo, J. P., Lopes, A. M. L., and Pereira, A. M. Tue .
"Annealing influence on the magnetostructural transition in Gd5Si1.3Ge2.7 thin films". United States. https://doi.org/10.1016/j.matlet.2015.05.029. https://www.osti.gov/servlets/purl/1227309.
@article{osti_1227309,
title = {Annealing influence on the magnetostructural transition in Gd5Si1.3Ge2.7 thin films},
author = {Pires, A. L. and Belo, J. H. and Gomes, I. T. and Hadimani, R. L. and Jiles, D. C. and Fernandes, L. and Tavares, P. B. and Araújo, J. P. and Lopes, A. M. L. and Pereira, A. M.},
abstractNote = {Due to the emerging cooling possibilities at the micro and nanoscale, such as the fast heat exchange rate, the effort to synthesize and optimize the magnetocaloric materials at these scales is rapidly growing. Here, we report the effect of different thermal treatments on Gd5Si1.3Ge2.7 thin film in order to evaluate the correlation between the crystal structure, magnetic phase transition and magnetocaloric effect. For annealing temperatures higher than 500ºC, the samples showed a typical paramagnetic behavior. On the other hand, thermal treatments below 500ºC promoted the suppression of the magnetostructural transition at 190 K, while the magnetic transition around 249 K is not affected. This magnetostructural transition extinction was reflected in the magnetocaloric behavior and resulted in a drastic decrease in the entropy change peak value (of about 68%). An increase in TC was reported, proving that at the nanoscale, heat treatments may be a useful tool to optimize the magnetocaloric properties in Gd5(SixGe1-x)4 thin films.},
doi = {10.1016/j.matlet.2015.05.029},
journal = {Materials Letters},
number = C,
volume = 159,
place = {United States},
year = {Tue May 19 00:00:00 EDT 2015},
month = {Tue May 19 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
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Giant negative thermal expansion at the nanoscale in the multifunctional material
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Negative Thermal Expansion in the Materials With Giant Magnetocaloric Effect
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