Magnetic entropy changes in nanogranular Fe:Ni61Cu39

S. Michalski, R. Skomski, T. Mukherjee, X. Zh Li, Ch Binek, David J Sellmyer

Research output: Contribution to journalArticle

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Abstract

Artificial environment-friendly Gd-free magnetic nanostructures for magnetic cooling are investigated by temperature-dependent magnetic measurements. We consider two-phase nanocomposites where nanoclusters (Fe) are embedded in a Ni61Cu39 matrix. Several composite films are produced by cluster deposition. The average Fe cluster size depends on the deposition conditions and can be tuned by varying the deposition conditions. The quasiequilibrium Curie temperature of the Fe particles is high, but slightly lower than that of bulk Fe due to finite-size effects. Our experiments have focused on ensembles of 7.7 nm Fe clusters in a matrix with a composition close to Ni61Cu39, which has a TC of 180 K. The materials are magnetically soft, with coercivities of order 16 Oe even at relatively low temperature of 100 K. The entropy changes are modest, -S 0.05 J/kgK in a field change of 1 T and 0.30 J/kgK in a field change of 7 T at a temperature of 180 K, which should improve if the cluster size is reduced.

Original languageEnglish (US)
Article number07A936
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011

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entropy
magnetic cooling
matrices
nanoclusters
magnetic measurement
coercivity
Curie temperature
nanocomposites
composite materials
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Michalski, S., Skomski, R., Mukherjee, T., Li, X. Z., Binek, C., & Sellmyer, D. J. (2011). Magnetic entropy changes in nanogranular Fe:Ni61Cu39 Journal of Applied Physics, 109(7), [07A936]. https://doi.org/10.1063/1.3562254

Magnetic entropy changes in nanogranular Fe:Ni61Cu39 . / Michalski, S.; Skomski, R.; Mukherjee, T.; Li, X. Zh; Binek, Ch; Sellmyer, David J.

In: Journal of Applied Physics, Vol. 109, No. 7, 07A936, 01.04.2011.

Research output: Contribution to journalArticle

Michalski, S, Skomski, R, Mukherjee, T, Li, XZ, Binek, C & Sellmyer, DJ 2011, 'Magnetic entropy changes in nanogranular Fe:Ni61Cu39 ', Journal of Applied Physics, vol. 109, no. 7, 07A936. https://doi.org/10.1063/1.3562254
Michalski, S. ; Skomski, R. ; Mukherjee, T. ; Li, X. Zh ; Binek, Ch ; Sellmyer, David J. / Magnetic entropy changes in nanogranular Fe:Ni61Cu39 In: Journal of Applied Physics. 2011 ; Vol. 109, No. 7.
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