Existence of cryogenic magnetic entropy change in Gd based nanoparticles

Magnetic nanoparticles with average diameter of 5–7 nm were prepared by nanocasting method inside of the pores of periodic silica matrix of SBA15 type. The uniform size of the pores limited the particles' growth what resulted in formation of nanocomposite consisting of monodisperse nanoparticle...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2017-06, Vol.43 (6), p.689-691
Main Authors: Zeleňáková, A., Hrubovčák, P., Berkutova, A., Kapusta, O., Zeleňák, V.
Format: Article
Language:English
Subjects:
Amorphous materials
Cryomagnetic properties
Entropy
Gadolinium
Gadolinium oxides
Magnetic properties
Nanocomposites
Nanoparticles
Refrigeration
Silica
Silicon dioxide
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Summary:Magnetic nanoparticles with average diameter of 5–7 nm were prepared by nanocasting method inside of the pores of periodic silica matrix of SBA15 type. The uniform size of the pores limited the particles' growth what resulted in formation of nanocomposite consisting of monodisperse nanoparticles of Gd2O3 embedded in amorphous silica matrix. Magnetic properties of the material were examined in magnetic fields up to 5 T and in temperature range 2–52 K. The magnetic entropy change of 29 J/kg K was observed at 2 K for field variation 5 T in the investigated nanocomposite what suggests this material could be feasible for cryomagnetic refrigeration applications.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4985974