Gd5(Si,Ge)4 thin film displaying large magnetocaloric and strain effects due to magnetostructural transition
- Iowa State Univ., Ames, IA (United States). Dept. of Electrical and Computer Engineering and Ames Lab.
- Univ. do Porto, Rua do Campo Alegre (Portugal)
- Imperial College, London (United Kingdom)
- Iowa State Univ., Ames, IA (United States). Ames Lab.
- Argonne National Lab. (ANL), Argonne, IL (United States)
Magnetic refrigeration based on the magnetocaloric effect is one of the best alternatives to compete with vapor-compression technology. Despite being already in its technology transfer stage, there is still room for optimization, namely, on the magnetic responses of the magnetocaloric material. In parallel, the demand for different magnetostrictive materials has been greatly enhanced due to the wide and innovative range of technologies that emerged in the last years (from structural evaluation to straintronics fields). In particular, the Gd5(SixGe1–x)4 compounds are a family of well-known alloys that present both giant magnetocaloric and colossal magnetostriction effects. Despite their remarkable properties, very few reports have been dedicated to the nanostructuring of these materials: here, we report a ~800 nm Gd5Si2.7Ge1.3 thin film. The magnetic and structural investigation revealed that the film undergoes a first order magnetostructural transition and as a consequence exhibits large magnetocaloric effect (–ΔSmMAX~8.83 J kg–1 K–1, ΔH = 5T) and giant thermal expansion (12000 p.p.m). The thin film presents a broader magnetic response in comparison with the bulk compound, which results in a beneficial magnetic hysteresis reduction. The ΔSmMAX exhibited by the Gd5(Si,Ge)4 thin film makes it a promising candidate for micro/nano magnetic refrigeration area.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Engineering and Physical Sciences Research Council (EPSRC) (United Kingdom); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357; AC02-07CH11358
- OSTI ID:
- 1392396
- Alternate ID(s):
- OSTI ID: 1226697
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 106; ISSN APPLAB; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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