MAGNETIC-PROPERTIES, RELAXATION, AND QUANTUM TUNNELING IN COFE2O4 NANOPARTICLES EMBEDDED IN POTASSIUM SILICATE

Authors
ZHANG XX HERNANDEZ JM TEJADA J ZIOLO RF
Citation
Xx. Zhang et al., MAGNETIC-PROPERTIES, RELAXATION, AND QUANTUM TUNNELING IN COFE2O4 NANOPARTICLES EMBEDDED IN POTASSIUM SILICATE, Physical review. B, Condensed matter, 54(6), 1996, pp. 4101-4106
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
54
Issue
6
Year of publication
1996
Pages
4101 - 4106
Database
ISI
SICI code
0163-1829(1996)54:6<4101:MRAQTI>2.0.ZU;2-Q
Abstract
We report magnetic properties and magnetic relaxation phenomena in a s ample comprised of nanocrystalline CoFe2O4 (similar to 97%)+gamma-Fe2O 3(similar to 3%) and polymer in potassium silicate (as magnetic glass) nanoparticle systems in which two very different barrier distribution s contributed to the relaxation behavior. We have demonstrated experim entally that only energy barrier distributions and the thermal activat ion process could not account for a plateau in the viscosity data at l ow temperatures. Quantum tunneling of magnetization is suggested below similar to 3 K.