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Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films

Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films,10.1109/TMAG.2008.2001523,IEEE Transactions on Magnetics,Norbert Marcel

Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films  
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Norbert Marcel Nemes, Mar Garcia-Hernandez, Zsolt Szatmari, Titusz Feher, Ferenc Simon, Cristina Visani, Vanessa Pena, Christian Miller, Javier Garcia-Barriocanal, Flavio Bruno, Zouhair Sefrioui, Carlos Leonhttp://academic.research.microsoft.com/io.ashx?type=5&id=12618446&selfId1=0&selfId2=0&maxNumber=12&query=
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 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 SrTiO3 substrate differ by 45 deg in 4- and 15-nm-thick LCMO films.
Journal: IEEE Transactions on Magnetics - IEEE TRANS MAGN , vol. 44, no. 11, pp. 2926-2929, 2008
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