RT Journal Article
T1 Magnetic susceptibility studies of the spin-glass and Verwey transitions in magnetite nanoparticles
A1 Lopez Maldonado, K. L.
A1 Presa Muñoz del Toro, Patricia de la
A1 Flores Tavizon, E.
A1 Farias Mancilla, J: R:
A1 Matutes Aquino, J. A.
A1 Hernando Grande, Antonio
A1 Elizalde Galindo, J. T.
AB Magnetite nanostructured powder samples were synthesized by aging chemical method. Phase, structural, and magnetic properties were characterized. X-ray diffraction patterns showed cubic magnetite pure phase, with average crystallite size, < D >, equal to 40 nm. Susceptibility measurements showed the well-known Verwey transition at a temperature of 90 K. The decrease of Verwey transition temperature, with respect to the one reported in literature (125 K) was attributed to the low average crystallite size. Moreover, the spin-glass like transition was observed at 35 K. Activation energy calculated from susceptibility curves, with values ranging from 6.26 to 6.93 meV, showed a dependence of spin-glass transition on frequency. Finally, hysteresis loops showed that there is not an effect of Verwey transition on magnetic properties. On the other hand, a large increase of coercivity and remanent magnetization at a temperature between 5 and 50 K confirmed the presence of a magnetic transition at low temperatures.
PB American Institute of Physics
SN 0021-8979
YR 2013
FD 2013-05-07
LK https://hdl.handle.net/20.500.14352/35545
UL https://hdl.handle.net/20.500.14352/35545
LA eng
NO © 2013 American Institute of Physics.Joint MMM-Intermag Conference (12.2013. Chicago)The authors would like to acknowledge UACJ, CIMAV, and IMA for the support given to this research.
DS Docta Complutense
RD 2 may 2024