INVESTIGADORES
STEREN Laura Beatriz
congresos y reuniones científicas
Título:
STRUCTURAL AND MAGNETIC CHARACTERIZATION OF LA1-XSRXMNO3-BASED THIN FILMS AND MULTILAYERS, GROWN BY PULSED LASER DEPOSITION.
Autor/es:
S CARREIRA; J. BRIATICO; J. SINNECKER; M SIRENA; L. STEREN
Lugar:
Buenos Aires
Reunión:
Conferencia; 27th International Conference on Low Temperature Physics; 2014
Resumen:
In this contribution we present a characterization of the magnetic and
structural properties of low-doped manganite films and multilayers. These
oxides have a potential application as components of magnetic tunnel junctions
and spin filter devices. The scope of our research is to determine the
influence of substrate-induced strains onto the magnetic properties of the
layers. Bulk La1-xSrxMnO3 (LSMO) are
insulators and antiferromagnetic up to x=0.1 and in many cases exhibit weak
ferromagnetism. However, we expect a different behaviour in the
properties of thin films due to the fact that growth conditions critically affect
the physical properties of oxide films.
We have deposited LSMO films and trilayers with x = 0.04, 0.1 and 0.33
and thickness varying from 4nm to 60nm. The samples were grown over (100) STO
by laser ablation. Magnetization measurements and X-ray diffraction experiments
were used to characterize the different structures. The temperature
dependence of the magnetization reveals the existence of a ferromagnetic order
in LSMO0.04 and LSMO0.1 thin films and the effect of the substrate can be
clearly appreciated in magnetization loops. The magnetic coupling across
the spacer in trilayers was probed by measuring detailed hysteresis
loops as a function of temperature.