Fe-Ni-Mn nanoparticles for magnetic cooling near room temperature

Varun Chaudhary; Apoorva Chaturvedi; Idapalapati Sridhar; Raju V. Ramanujan

doi:10.1109/LMAG.2014.2366078

Fe-Ni-Mn nanoparticles for magnetic cooling near room temperature

Varun Chaudhary, Apoorva Chaturvedi, Idapalapati Sridhar, Raju V. Ramanujan^*

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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 (T_C) of the alloy to 338 K from 443 K. The change in entropy (ΔS_M) 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.

Original language	English
Article number	6942166
Journal	IEEE Magnetics Letters
Volume	5
DOIs	https://doi.org/10.1109/LMAG.2014.2366078
Publication status	Published - 2014
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2010-2012 IEEE.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials

Keywords

General topics
iron alloy
magnetocaloric effect
nanoparticles
relative cooling power

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10.1109/LMAG.2014.2366078

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title = "Fe-Ni-Mn nanoparticles for magnetic cooling near room temperature",

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 (ΔSM) 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.",

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AU - Chaudhary, Varun

AU - Chaturvedi, Apoorva

AU - Sridhar, Idapalapati

AU - Ramanujan, Raju V.

PY - 2014

Y1 - 2014

N2 - 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 (ΔSM) 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.

AB - 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 (ΔSM) 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.

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KW - relative cooling power

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Fe-Ni-Mn nanoparticles for magnetic cooling near room temperature

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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