Scaling Analysis of the Magnetocaloric Effect in Co/Au Nanoparticles

• Authors: P. Hrubovčák , A. Zeleňáková , V. Zeleňák , V. Franco
• Languages of publication: EN

Abstracts

EN

The system of superparamagnetic Co/Au bimetallic nanoparticles of average diameter 7 nm was investigated with respect to its magnetocaloric properties. DC magnetic measurements revealed the presence of field dependent zero field cooled M(T) maximum (6-8 K) and significant zero field cooled/field cooled irreversibility at low temperatures in the system. Documented thermal hysteresis disallow standard magnetic entropy change calculation from isothermal M(H) data, thus we attempted to employ zero field cooled M(T) data for this purpose. Magnetic entropy change was calculated employing the Maxwell relation. In maximal field variation of 1 T relative high magnetic entropy change for nanoparticles Δ S_M ≈ 0.7 J/(kg K) at T =9 K was observed. The data collapsed onto single universal curve after proper axis rescaling.

Keywords

EN

75.30.Sg; 75.75.Fk; 65.40.gd

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 75.75.Fk: Domain structures in nanoparticles
• 65.40.gd: Entropy

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 795-797

Dates

published

2017-04

Contributors

author

P. Hrubovčák

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Zeleňáková

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

V. Zeleňák

• Institute of Inorganic Chemistry, Faculty of Sciences, P.J. Šafárik University, Moyzesova 11, 041 54 Košice, Slovakia

author

V. Franco

• Department of Condensed Matter Physics, University of Sevilla, P.O. Box 1065, 41080 Sevilla, Spain

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Identifiers

DOI

10.12693/APhysPolA.131.795