Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films



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Nemes, Norbert Marcel and García Hernández, Mar and Szatmári, Zsolt and Fehér, Titusz and Simon, Ferenc and Visani, Cristina and Peña, Vanessa and Miller, Christian and Garcia Barriocanal, Javier and Bruno, Flavio Yair and Sefrioui, Zouhair and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo (2009) Thickness Dependent Magnetic Anisotropy of Ultrathin LCMO Epitaxial Thin Films. IEEE transactions on magnetics, 44 (11). pp. 2926-2929. ISSN 0018-9464

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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.

Uncontrolled Keywords:Epitaxial layers; Magnetic anisotropy; Magnetic resonance; Manganites; Thin films
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:33516
Deposited On:08 Oct 2015 15:41
Last Modified:05 Jul 2018 16:44

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