Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 48, Issue 30, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/48/30/305003
Keywords
magnetocaloric effect; relative cooling power; critical behaviour; magnetic nanoparticles
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Funding
- National Research Foundation, Prime Minister's office, Singapore
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Earth-abundant, low-cost, and rare earth free magnetocaloric nanomaterials have attracted considerable attention for affordable, 'green', energy-efficient thermal management applications. Hence, we investigated the magnetocaloric properties and critical behavior of (Fe70Ni30)(92)Mn-8 alloy nanoparticles. A near room temperature magnetocaloric effect, with a high relative cooling power (RCP), was obtained by alloying FeNi with Mn and fcc (gamma) phase stabilization. The Curie temperature (T-C) of the gamma-phase was 40 K less than that of the T-C of the bcc (alpha) phase. For a field change of 5 T, the RCP for the alpha- and gamma-phase was found to be 507 J kg(-1) and 466 J kg(-1), respectively; these values are higher than those for Gd nanoparticles. The RCP exhibited a power law relationship with magnetic field H. Critical exponents values of delta = 4.71, beta = 0.319 and gamma = 1.195 were obtained, close to those obtained from the short range order 3D-Heisenberg model. Our results demonstrate the feasibility of developing high RCP, low-cost, rare earth free magnetocaloric nanoparticles for near room temperature applications.
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