Isothermal entropy changes in nanocomposite Co:Ni 67Cu 33

S. Michalski; R. Skomski; X. Zh Li; D. Le Roy; T. Mukherjee; Ch Binek; D. J. Sellmyer

doi:10.1063/1.3676423

Isothermal entropy changes in nanocomposite Co:Ni ₆₇Cu ₃₃

S. Michalski, R. Skomski, X. Zh Li, D. Le Roy, T. Mukherjee, Ch Binek, D. J. Sellmyer

Physics and Astronomy

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Abstract

The temperature-dependent magnetic properties of artificial rare-earth, free-magnetic nanostructures are investigated for magnetic cooling. We consider two-phase nanocomposites, where 2 nm nanoclusters of cobalt are embedded in a Ni ₆₇Cu ₃₃ matrix. Several composite films were produced by cluster deposition. The average Co nanocluster size can be tuned by varying the deposition conditions. Isothermal magnetization curves were measured at various temperatures 150 K < T < 340 K in steps of 10 K. The isothermal entropy changes δS were calculated using the Maxwell relation. The entropy changes measured were, -δS 0.15 J/kgK in a field change of 1 T at 260 K and 0.72 J/kgK in a field change of 7 T at 270 K.

Original language	English (US)
Article number	07A930
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3676423
State	Published - Apr 1 2012

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General Physics and Astronomy

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@article{16083c543daf4c6ea4c586db3b8ccead,

title = "Isothermal entropy changes in nanocomposite Co:Ni 67Cu 33 ",

abstract = "The temperature-dependent magnetic properties of artificial rare-earth, free-magnetic nanostructures are investigated for magnetic cooling. We consider two-phase nanocomposites, where 2 nm nanoclusters of cobalt are embedded in a Ni 67Cu 33 matrix. Several composite films were produced by cluster deposition. The average Co nanocluster size can be tuned by varying the deposition conditions. Isothermal magnetization curves were measured at various temperatures 150 K < T < 340 K in steps of 10 K. The isothermal entropy changes δS were calculated using the Maxwell relation. The entropy changes measured were, -δS 0.15 J/kgK in a field change of 1 T at 260 K and 0.72 J/kgK in a field change of 7 T at 270 K.",

author = "S. Michalski and R. Skomski and Li, {X. Zh} and {Le Roy}, D. and T. Mukherjee and Ch Binek and Sellmyer, {D. J.}",

note = "Funding Information: This work is supported by the Nebraska Research Initiative (S.M. and R.S.), Army Research Office under award No. W911-NF-09-2-0039 (D.L.R., X.Z.L., and D.J.S.), NSF Career DMR-0547887 (T.M. and Ch.B.), and NCMN [Central Facility Support].",

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doi = "10.1063/1.3676423",

language = "English (US)",

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journal = "Journal of Applied Physics",

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AU - Michalski, S.

AU - Skomski, R.

AU - Li, X. Zh

AU - Le Roy, D.

AU - Mukherjee, T.

AU - Binek, Ch

AU - Sellmyer, D. J.

N1 - Funding Information: This work is supported by the Nebraska Research Initiative (S.M. and R.S.), Army Research Office under award No. W911-NF-09-2-0039 (D.L.R., X.Z.L., and D.J.S.), NSF Career DMR-0547887 (T.M. and Ch.B.), and NCMN [Central Facility Support].

PY - 2012/4/1

Y1 - 2012/4/1

N2 - The temperature-dependent magnetic properties of artificial rare-earth, free-magnetic nanostructures are investigated for magnetic cooling. We consider two-phase nanocomposites, where 2 nm nanoclusters of cobalt are embedded in a Ni 67Cu 33 matrix. Several composite films were produced by cluster deposition. The average Co nanocluster size can be tuned by varying the deposition conditions. Isothermal magnetization curves were measured at various temperatures 150 K < T < 340 K in steps of 10 K. The isothermal entropy changes δS were calculated using the Maxwell relation. The entropy changes measured were, -δS 0.15 J/kgK in a field change of 1 T at 260 K and 0.72 J/kgK in a field change of 7 T at 270 K.

AB - The temperature-dependent magnetic properties of artificial rare-earth, free-magnetic nanostructures are investigated for magnetic cooling. We consider two-phase nanocomposites, where 2 nm nanoclusters of cobalt are embedded in a Ni 67Cu 33 matrix. Several composite films were produced by cluster deposition. The average Co nanocluster size can be tuned by varying the deposition conditions. Isothermal magnetization curves were measured at various temperatures 150 K < T < 340 K in steps of 10 K. The isothermal entropy changes δS were calculated using the Maxwell relation. The entropy changes measured were, -δS 0.15 J/kgK in a field change of 1 T at 260 K and 0.72 J/kgK in a field change of 7 T at 270 K.

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JF - Journal of Applied Physics

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ER -

Isothermal entropy changes in nanocomposite Co:Ni ₆₇Cu ₃₃

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