INVESTIGADORES
STEREN Laura Beatriz
artículos
Título:
Magnetic relaxation in bulk and film manganite compounds
Autor/es:
M. SIRENA; L.B. STEREN; J. GUIMPEL
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2001 vol. 64 p. 104409 - 104415
ISSN:
1098-0121
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.