Magnetic properties, relaxation, and quantum tunneling in CoFe2O4 nanoparticles embedded in potassium silicate

X. X. Zhang*, J. M. Hernandez, J. Tejada, R. F. Ziolo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We report magnetic properties and magnetic relaxation phenomena in a sample comprised of nanocrystalline CoFe2O4 (~97%) + γFe2O3 (~3%) and polymer in potassium silicate (as magnetic glass) nanoparticle systems in which two very different barrier distributions contributed to the relaxation behavior. We have demonstrated experimentally that only energy barrier distributions and the thermal activation process could not account for a plateau in the viscosity data at low temperatures. Quantum tunneling of magnetization is suggested below ~3 K.

Original languageEnglish (US)
Pages (from-to)4101-4106
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number6
StatePublished - Aug 1 1996
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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