Magnetic Properties of LCMO/LSMO Thin Films on LAO and ALO Substrates |
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Authors: | T. Nurgaliev U. Topal B. Blagoev E. Mateev |
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Affiliation: | 1. Institute of Electronics BAS, 72 Tsarigradsko Chosse, 1784, Sofia, Bulgaria 2. TUBITAK-UME, P.K.54, 41470, Gebze-Kocaeli, Turkey
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Abstract: | Two La0.7Ca0.3MnO3(35?nm)/La0.7Sr0.3MnO3(30?nm) manganite bilayers were grown on LaAlO3(LAO) and Al2O3(ALO) substrates (i.e., the LCMO/LSMO/LAO and LCMO/LSMO/ALO samples) using a magnetron sputtering technique. The individual Curie temperatures of the LSMO and LCMO sublayers were 325?K, 225?K for the LCMO/LSMO/LAO sample and 325?K, 210?K for the LCMO/LSMO/ALO sample. The zero-field-cooled (ZFC) magnetization of the samples demonstrated maximums at ??150?K and ??170?K, respectively. The difference between the ZFC and field-cooled (FC) magnetizations was greater for the bilayer deposited on ALO substrate due to its polycrystalline nature. The coercive field of the LCMO/LSMO/LAO sample was greater at room temperature 298?K than at 150?K: This was interpreted as due to a change of the magnetic state of the LCMO sublayer in this temperature interval. |
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