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Magnetic Anisotropy and Magnetocaloric Effect (MCE) in NiFe2O4 Nanoparticles

Published online by Cambridge University Press:  01 February 2011

J. Gass ,
N. A. Frey ,
M. B. Morales ,
M. J. Miner ,
S. Srinath  and
H. Srikanth
J. Gass
Affiliation:
[email protected], University of South Florida, Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
N. A. Frey
Affiliation:
[email protected], University of South Florida, Department of Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
M. B. Morales
Affiliation:
[email protected], University of South Florida, Department of Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
M. J. Miner
Affiliation:
[email protected], University of South Florida, Department of Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
S. Srinath
Affiliation:
[email protected], University of South Florida, Department of Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
H. Srikanth
Affiliation:
[email protected], University of South Florida, Department of Physics, 4202 East Fowler Ave, Tampa, FL, 33620, United States
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Abstract

Magnetic refrigeration based on the magnetocaloric effect (MCE) has been proposed as an attractive alternative to gas compression technology. Some calculations suggest that MCE can be obtained with higher efficiencies than compressor driven refrigeration. We examine the MCE in a system of nickel ferrite nanoparticles with size range of 6 to 15 nm. A peak in the MCE at 55 K is observed that increases with higher magnetic fields. This gives this system a relatively high peak entropy change compared to other ferrite systems. A sensitive radio-frequency (RF) transverse susceptibility measurement has also been used to study the magnetic anisotropy. We show that the MCE peak is not associated with the blocking temperature and is likely a field-driven surface spin reorientation which also has a signature in the transverse susceptibility. Work supported by NSF-CTS-0408933 and ARO- W911NF-05-1-0354

Keywords

magneticnanoscalemagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 962: Symposium P – Nanoscale Magnets – Synthesis, Self-Assembly, Properties and Applications , 2006 , 0962-P05-03
Copyright
Copyright © Materials Research Society 2007

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References

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