Abstract

MARIN, Lorena; GOMEZ, María Elena; REYES, David F  and  RODRIGUEZ, Luis A. Dependencia de la T_C con espesor relativo en bicapas ferroantiferro del sistema La_1-XCa_XMnO₃. Rev. LatinAm. Metal. Mater. [online]. 2010, vol.30, n.2, pp.119-123. ISSN 0255-6952.

Bilayers of the La_1-XCa_XMnO₃ system manganite type in their Ferromagnetic La_2/3Ca_1/3MnO₃ (F-LCMO) and antiferromagnetic La_1/3Ca_2/3MnO₃ (AF-LCMO) phase were grown on (100) oriented SrTiO₃ monocrystalline substrates. The bilayers were grown in situ by using a dc sputtering technique at high oxygen pressure and at a substrate temperature of 850 °C and pressure of 3,5 mbar. On the substrate we grew the antiferromagnetic-layer with a given Antiferromagnetic thickness, t_AF and then the ferromagnetic layer on the AF-layer, with a given F thickness, t_F. The ratio of t_AF/t_F thickness varied maintaining constant the total thickness of the bilayer in 70 nm. The temperature dependence of the magnetization curves for different applied magnetic field cooling, H_FC, (100 Oe - 1000 Oe) show that saturation magnetization, M(0), increases with the increasing of H_FC. We determined the transition temperature, Tc, for each thermal demagnetization curve, M(T). The transition temperature, Tc, shows an increase with the increasing of the applied field and a shift toward bigger values with the increase of the ferromagnetic layer in the bilayer.

Keywords : Ferro [antiferro bilayers]; manganites; magnetic properties.