Magnetic interactions in silica coated nanoporous assemblies of CoFe2O4 nanoparticles with cubic magnetic anisotropy

Nanotechnology
S LauretiD Peddis

Abstract

Magnetic interactions in silica coated spherical nanoporous assemblies of CoFe(2)O(4) nanoparticles have been investigated by low temperature field dependent remanent magnetization (M(DCD) and M(IRM)) and magnetization relaxation measurements. The synthesis procedure leads to the formation of spherical aggregates of about 50-60 nm in diameter composed of hexagonal shaped nanocrystals with shared edges. The negative deviation from the non-interacting case in the Henkel plot indicates the predominance of dipole-dipole interactions favouring the demagnetized state, although the presence of exchange interactions in the porous system cannot be excluded. The activation volume, derived from time dependent magnetization measurements, turns out to be comparable with the particle physical volume, thus indicating, in agreement with static and dynamic irreversible magnetization measurements, that the magnetization reversal actually involves individual crystals.

References

Jul 8, 1996·Physical Review Letters·R H KodamaS Foner
Jan 5, 2010·Journal of Colloid and Interface Science·Carla CannasAnna Musinu

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Citations

Jan 31, 2012·Physical Chemistry Chemical Physics : PCCP·D PeddisD Fiorani
Mar 11, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jooneon ParkMichael C Granger
Jul 2, 2015·ACS Nano·Carla CannasGaetano Campi
Mar 25, 2016·Scientific Reports·Qing XiangPaulo Cesar Morais
Nov 25, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kakoli BhattacharyaPritam Deb
Oct 25, 2016·Nanoscale Research Letters·Shitao XuMin Wang
Oct 21, 2020·Physical Chemistry Chemical Physics : PCCP·S Fatemeh ShamsCarolin Schmitz-Antoniak

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