Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-15
Physics
Condensed Matter
Strongly Correlated Electrons
Presented at Intermag conference (Madrid, 2008). Accepted for publication in IEEE Transactions on Magnetics
Scientific paper
10.1109/TMAG.2008.2001523
The magnetic properties of La0.7Ca0.3MnO3 (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 approx. 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 SrTiO3 substrate differ by 45 degrees in 4 nm and 15 nm thick LCMO films.
Bruno Flavio
Feher Titusz
Garcia-Barriocanal Javier
Garcia-Hernandez M. M.
Leon Carlos
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