Посилання:Existence of cryogenic magnetic entropy change in Gd based nanoparticles / A. Zeleňáková, P. Hrubovčák, A. Berkutova, O. Kapusta, V. Zeleňák // Физика низких температур. — 2017. — Т. 43, № 6. — С. 867-870. — Бібліогр.: 18 назв. — англ.
Підтримка:This work was supported by the Slovak Research and
Development Agency under the contracts APVV-0073-14
and APVV-520-15 and by the VEGA projects (No.
1/0377/16, No. 1/0745/17). Authors would like to thank
V. Girman for realization of TEM experiments. Author
A.B. would like to thank Visegrad Fund under contract
No. 51501516 for financial support.
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.