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Title: Magnetocaloric properties and critical behavior of high relative cooling power FeNiB nanoparticles

Low cost magnetocaloric nanomaterials have attracted considerable attention for energy efficient applications. We report a very high relative cooling power (RCP) in a study of the magnetocaloric effect in quenched FeNiB nanoparticles. RCP increases from 89.8 to 640 J kg{sup −1} for a field change of 1 and 5 T, respectively, these values are the largest for rare earth free iron based magnetocaloric nanomaterials. To investigate the magnetocaloric behavior around the Curie temperature (T{sub C}), the critical behavior of these quenched nanoparticles was studied. Detailed analysis of the magnetic phase transition using the modified Arrott plot, Kouvel-Fisher method, and critical isotherm plots yields critical exponents of β = 0.364, γ = 1.319, δ = 4.623, and α = −0.055, which are close to the theoretical exponents obtained from the 3D-Heisenberg model. Our results indicate that these FeNiB nanoparticles are potential candidates for magnetocaloric fluid based heat pumps and low grade waste heat recovery.
Authors:
 [1] ;  [2] ;  [2] ; ; ;  [3] ;  [4]
  1. Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798 (Singapore)
  2. (Singapore)
  3. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
  4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
Publication Date:
OSTI Identifier:
22308172
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; BORON COMPLEXES; COOLING; CURIE POINT; FLUIDS; HEAT PUMPS; HEISENBERG MODEL; IRON COMPOUNDS; ISOTHERMS; MAGNETIC PROPERTIES; NANOMATERIALS; NANOPARTICLES; NANOSTRUCTURES; PHASE TRANSFORMATIONS; RARE EARTHS