INVESTIGADORES
STEREN Laura Beatriz
artículos
Título:
Substrate effect on the magnetic behavior of manganite films
Autor/es:
L.B. STEREN; M. SIRENA; J. GUIMPEL
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Año: 2000 vol. 87 p. 6755 - 6757
ISSN:
0021-8979
Resumen:
The film thickness (t) dependence of the magnetic properties of La0.6Sr0.4MnO3 (LSMO) films grown on (001) MgO and (001) SrTiO3
substrates has been studied. Hysteresis loops measured at low
temperature show a smooth increase of the retentivity accompanied by a
decrease of the coercitive field as the film thickness increases. The
increase of coercitivity with decreasing t
can be interpreted in terms of a change in the domain structure of the
films mainly due to an augmentation of domain pinning defects. The
magnetic anisotropy has been measured using ferromagnetic resonance
(FMR). A volume (VA) and a surface (SA) anisotropy contribution have
been deduced from FMR angular dependence studies for both series of
samples. In the LSMO films grown on MgO a VA component that corresponds
to an easy-axis perpendicular to the plane of the films has been found
while in contrast, the LSMO films grown on SrTiO3
present an easy-plane anisotropy. The SA is positive for both series
favoring a perpendicular magnetic anisotropy. The measured magnetic
anisotropy has been assigned to substrate-induced effects.