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Title: Growth and characterization of Pt-protected Gd{sub 5}Si{sub 4} thin films

Successful growth and characterization of thin films of giant magnetocaloric Gd{sub 5}(Si{sub x}Ge{sub 1−x}){sub 4} were reported in the literature with limited success. The inherent difficulty in producing this complex material makes it difficult to characterize all the phases present in the thin films of this material. Therefore, thin film of binary compound of Gd{sub 5}Si{sub 4} was deposited by pulsed laser deposition. It was then covered with platinum on the top of the film to protect against any oxidation when the film was exposed to ambient conditions. The average film thickness was measured to be approximately 350 nm using a scanning electron microscopy, and the composition of the film was analyzed using energy dispersive spectroscopy. X-ray diffraction analysis indicates the presence of Gd{sub 5}Si{sub 4} orthorhombic structure along with Gd{sub 5}Si{sub 3} secondary phase. The transition temperature of the film was determined from magnetic moment vs. temperature measurement. The transition temperature was between 320 and 345 K which is close to the transition temperature of the bulk material. Magnetic moment vs. magnetic field measurement confirmed that the film was ferromagnetic below 342 K.
Authors:
;  [1] ; ;  [2] ; ;  [2] ;  [3]
  1. Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States)
  2. Materials and Engineering Physics Program, Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22273832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; ENERGY BEAM DEPOSITION; FERROMAGNETIC MATERIALS; GADOLINIUM SILICIDES; LASER RADIATION; MAGNETIC FIELDS; MAGNETIC MOMENTS; ORTHORHOMBIC LATTICES; OXIDATION; PLATINUM; PULSED IRRADIATION; SCANNING ELECTRON MICROSCOPY; TEMPERATURE MEASUREMENT; THIN FILMS; TRANSITION TEMPERATURE; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY