Suppression of magnetostructural transition on GdSiGe thin film after thermal cyclings

THIN SOLID FILMS

卷:621

Article

Pires, A. L.^1,2  Belo, J. H.^1,2  Gomes, I. T.^1,2  Hadimani, R. L.^3,4  Schlagel, D. L.⁴  Lograsso, T. A.^4,5  Jiles, D. C.^3,4  Lopes, A. M. L.^1,2  Araujo, J. P.^1,2  Pereira, A. M.^1,2 

[1] Univ Porto, Fac Ciencias, IFIMUP, Rua Campo Alegre, P-4169007 Oporto, Portugal

[2] Univ Porto, Fac Ciencias, Inst Nanosci & Nanotechnol, Dept Fis & Astron, Rua Campo Alegre, P-4169007 Oporto, Portugal

[3] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA

[4] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

[5] Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA

关键词: Thermal cycling;    Magnetocaloric effect;    Thin films;    Microstructure;   

DOI  :  10.1016/j.tsf.2016.09.013

来源: Elsevier

【 摘 要 】

The influence of thermal cycling on the microstructure, magnetic phase transition and magnetic entropy change of a Gd5Si1.3Ge2.7 thin film up to 1000 cycles is investigated. The authors found that after 1000 cycles a strong reduction of the crystallographic phase responsible for the magnetostructural transition (Orthorhombic II phase) occurs. This is attributed to chemical disorder, caused by the large number of expansion/compression cycles that the Orthorhombic II phase undergoes across the magnetostructural transition. The suppression of the magnetostructural transition corresponds to a drastic decrease of the thin film magnetic entropy change. These results reveal the importance of studying the thermal/magnetic cycles influence on magnetostructural transitions as they can damage a real-life device. (C) 2016 Elsevier B.V. All rights reserved.

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