%0 Journal Article
%A Nemes, Norbert Marcel
%A García Hernández, Mar
%A Szatmári, Zsolt
%A Fehér, Titusz
%A Simon, Ferenc
%A Visani, Cristina
%A Peña, Vanessa
%A Miller, Christian
%A Garcia Barriocanal, Javier
%A Bruno, Flavio Yair
%A Sefrioui, Zouhair
%A León Yebra, Carlos
%A Santamaría Sánchez-Barriga, Jacobo
%T Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films
%D 2009
%@ 0018-9464
%U https://hdl.handle.net/20.500.14352/44762
%X The magnetic properties of La_0.7Ca_0.3Mn_O3 (LCMO) manganite thin films were studied with magnetometry and ferromagnetic resonance as a function of film thickness. They maintain the colossal magnetoresistance behavior with a pronounced metal-insulator transition around 150-200 K, except for the very thinnest films studied (3 nm). Nevertheless, LCMO films as thin as 3 nm remain ferromagnetic, without a decrease in saturation magnetization, indicating an absence of dead-layers, although below approximately 6 nm the films remain insulating at low temperature. Magnetization hysteresis loops reveal that the magnetic easy axes lie in the plane of the film for thicknesses in the range of 4-15 nm. Ferromagnetic resonance studies confirm that the easy axes are in-plane, and find a biaxial symmetry in-plane with two, perpendicular easy axes. The directions of the easy axes with respect to the crystallographic directions of the cubic SrTiO_3 substrate differ by 45 deg in 4- and 15-nm-thick LCMO films.
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