Title :
Fe–Ni–Mn Nanoparticles for Magnetic Cooling Near Room Temperature
Author :
Chaudhary, Varun ; Chaturvedi, Apoorva ; Sridhar, Idapalapati ; Ramanujan, Raju V.
Author_Institution :
Interdiscipl. Grad. Sch., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
We have studied the magnetocaloric effect in high-energy ball-milled (Fe70Ni30)95Mn5 alloy nanoparticles. The partial substitution of Fe and Ni by Mn decreases the Curie temperature (TC) of the alloy to 338 K from 443 K. The change in entropy (Δ SM) occurs over a broad range of temperatures, which results in high relative cooling power (RCP). RCP increases from 26 to 470 J · kg-1 for a field change of 0.5 T and 5 T, respectively; these values are comparable to the benchmark magnetocaloric material, gadolinium. The RCP is proportional to field H to the power 1+1/δ, with a critical exponent δ of 4.34.
Keywords :
Curie temperature; entropy; iron alloys; magnetic cooling; magnetic particles; manganese alloys; nanoparticles; nickel alloys; (Fe70Ni30)95Mn5; Curie temperature; critical exponent; entropy; high relative cooling power; high-energy ball-milled alloy nanoparticles; magnetic cooling; magnetocaloric effect; partial substitution; Amorphous magnetic materials; Cooling; Entropy; Magnetic hysteresis; Metals; Nanoparticles; General topics; Iron alloy; Magnetocaloric effect; Nanoparticles; Relative cooling power; iron alloy; magnetocaloric effect; nanoparticles; relative cooling power;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2014.2366078
