MAGNETIC-RELAXATION AND QUANTUM TUNNELING IN NANOCRYSTALLINE PARTICLES

Authors
ZHANG XX ZIOLO R KROLL EC BOHIGAS X TEJADA J
Citation
Xx. Zhang et al., MAGNETIC-RELAXATION AND QUANTUM TUNNELING IN NANOCRYSTALLINE PARTICLES, Journal of magnetism and magnetic materials, 140, 1995, pp. 1853-1854
Citations number
7
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
140
Year of publication
1995
Part
3
Pages
1853 - 1854
Database
ISI
SICI code
0304-8853(1995)140:<1853:MAQTIN>2.0.ZU;2-7
Abstract
Low-temperature magnetic relaxation phenomena have been studied in two samples consisting of nanocrystalline gamma-Fe2O3 and polymer in eith er water (as ferrofluid) or in potassium silicate (as glass). The rela xation of the magnetization follows a logarithmic law and the magnetic viscosity, S, tends to be independent of temperature below 2.1 K for the glass sample, giving evidence of macroscopic quantum tunneling of the magnetization.