Finite size effects on the magnetocaloric properties around blocking temperature in γ-Fe2O3 nanoparticles

A. Elouafi, R. Moubah, S. Derkaoui, A. Tizliouine, R. Cherkaoui, S. Shi, A. Bendani, M. Sajieddine and H. Lassri

Physica A: Statistical Mechanics and its Applications, 2019, vol. 523, issue C, 260-267

Abstract: We investigate the magnetocaloric properties of γ-Fe2O3 nanoparticles with an emphasis on size effects. The magnetic measurements have demonstrated that the properties are relevant for spin glasses at low temperature. The blocking temperature (TB) was found to decrease from 208 to 94 K with decreasing average size from 8.5 to 2.7 nm due to surface effects. The temperature dependence of the magnetic entropy change (-ΔSM) was calculated from the isothermal magnetization. The caret shape of the (-ΔSM) curves shows that the magnetic transition near TB is a phase transition in line with Arrott plots. Under a magnetic field change of 10 kOe, the (- ΔSM) and the relative cooling power increase from 1.07 to 1.4 J/kg.K and 26 to 94 J/kg with increasing from 2.7 to 8.5 nm, respectively. The increase of the magnetocaloric performance with increasing size was attributed to the increase in magnetization.

Keywords: Magnetic refrigeration; Magnetic nanoparticles; Blocking temperature; Magnetocaloric effect; Magnetic entropy change (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:523:y:2019:i:c:p:260-267

DOI: 10.1016/j.physa.2019.02.039

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