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Iron Oxide-based Magnetic Nanoparticles for High Temperature Span Magnetocaloric Applications

Published online by Cambridge University Press:  03 June 2014

V. Chaudhary  and
R. V. Ramanujan
V. Chaudhary
Affiliation:
Interdisciplinary Graduate School, Nanyang Technological University, Singapore, 639798 Energy Research Institute @NTU (ERI@N), Nanyang Technological University, Singapore 637553 School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798
R. V. Ramanujan*
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798
*
#Corresponding author: [email protected]
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Abstract

The magnetocaloric effect of chemically synthesized Mn0.3Zn0.7Fe2O4 superparamagnetic nanoparticles with average crystallite size of 11 nm is reported. The magnitude of the magnetic entropy change (ΔSM), calculated from magnetization isotherms in the temperature range of 30 K to 400 K, increases from - 0.16 J-kg-1K-1 for a field of 1 T to - 0.88 J-kg-1K-1 for 5 T at room temperature. Our results indicate that ΔSM values are much higher than primarily reported values for this class of nanoparticles. ΔSM is not limited to the ferromagnetic-paramagnetic transition temperature; instead, it occurs over a broad range of temperatures, resulting in high relative cooling power.

Keywords

magnetic propertiesoxidepowder
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1708: Symposium VV – Magnetic Nanomaterials and Nanostructures , 2014 , mrss14-1708-vv10-08
Copyright
Copyright © Materials Research Society 2014 

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References

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