skip to main content

SciTech ConnectSciTech Connect

Title: Annealing effect on the magnetic induced austenite transformation in polycrystalline freestanding Ni-Co-Mn-In films produced by co-sputtering

Ni-Co-Mn-In freestanding films, with a magneto-structural transformation at room temperature were successfully produced by co-sputtering and post-annealing methods leading to film composition mastering. For a post-annealing temperature of 700 °C, the phase transformation occurs slightly above room temperature, with a twisted martensitic microstructure phase observed at 300 K by Field Emission Scanning Electron Microscopy. Magnetization measurements on a polycrystalline film showed a phase transformation from a weakly magnetic martensite to a magnetic austenite phase. Moreover, an inverse magnetocaloric effect with an entropy variation of 4 J/kg K under 5 T was also measured. A simple magneto-actuation experiment based on the magnetic induced austenite transformation was also successfully completed. The possibility to insert such films in microsystems is clearly demonstrated in this work.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Univ. Grenoble Alpes, Inst. NEEL, F-38042 Grenoble, Cedex 9 (France)
  2. (France)
  3. Institut Laue Langevin, 38000 Grenoble (France)
Publication Date:
OSTI Identifier:
22412973
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 3; Other Information: (c) 2015 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; ANNEALING; AUSTENITE; ENTROPY; FIELD EMISSION; FILMS; MAGNETIC PROPERTIES; MAGNETIZATION; MARTENSITE; MARTENSITIC STEELS; MICROSTRUCTURE; PHASE TRANSFORMATIONS; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; SPUTTERING; TEMPERATURE DEPENDENCE