Publication: Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films
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2009-11
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IEEE-Institute of Electrical and Electronics Engineers
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Abstract
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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©2009 IEEE-Institute of Electrical and Electronics Engineers. N. N. M. acknowledges the “Ramon y Cajal” fellowship of the Spanish Ministry of Science and Education. This work was supported in part by SPIN-MAT06024 C01 and C02 and by Marie-Curie-IRG grant No. 024861, and by OTKA PF63954, K68807 and NK60984.
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