INVESTIGADORES
SIRENA Martin
artículos
Título:
Magnetic relaxation in bulk and film manganite compounds
Autor/es:
M. SIRENA; L. B. STEREN; J. GUIMPEL
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Referencias:
Año: 2002 p. 104409 - 104414
ISSN:
0163-1829
Resumen:
We have investigated the time dependence of the magnetic and transport properties of La0.6Sr0.4MnO3 films
and bulk samples. A significant magnetic aftereffect has been observed in all the samples through magnetization
and resistivity measurements. The relaxation effects can be described by the addition of a logarithmic to
an exponential contribution. The weight of each contribution is strongly temperature dependent, with a relaxation
that is predominantly logarithmic at low temperatures (T,30 K) and exponential at high temperatures
(T.100 K). As the film thickness is decreased the magnetic relaxation becomes more important and the
magnetic viscosity of the system increases. These results point out the important role of structural defects in the
magnetic relaxation of the samples.0.6Sr0.4MnO3 films
and bulk samples. A significant magnetic aftereffect has been observed in all the samples through magnetization
and resistivity measurements. The relaxation effects can be described by the addition of a logarithmic to
an exponential contribution. The weight of each contribution is strongly temperature dependent, with a relaxation
that is predominantly logarithmic at low temperatures (T,30 K) and exponential at high temperatures
(T.100 K). As the film thickness is decreased the magnetic relaxation becomes more important and the
magnetic viscosity of the system increases. These results point out the important role of structural defects in the
magnetic relaxation of the samples.T,30 K) and exponential at high temperatures
(T.100 K). As the film thickness is decreased the magnetic relaxation becomes more important and the
magnetic viscosity of the system increases. These results point out the important role of structural defects in the
magnetic relaxation of the samples.T.100 K). As the film thickness is decreased the magnetic relaxation becomes more important and the
magnetic viscosity of the system increases. These results point out the important role of structural defects in the
magnetic relaxation of the samples.