Prokhorov V. G.
Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films / V. G. Prokhorov, G. G. Kaminsky, V. S. Flis, J. M. Kim, T. W. Eom, J. S. Park, Y. P. Lee, V. L. Svetchnikov // Физика низких температур. - 2012. - Т. 38, № 1. - С. 52-61. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2012_38_1_9
The structural, the magnetic and the transport properties of La0,7Ca0,3MnO3/La0,9Ca0,1MnO3 multilayer film, prepared by rf-magnetron sputtering, have been investigated. The high-resolution electron-microscopy studies reveal the formation of different crystal structures in the constituent sublayers, but without sharp and well-defined interfaces. At the same time, the small regions of double-period modulated phase exist in the La0,9Ca0,1MnO3 sublayers at room temperature, manifesting the formation of charge-ordered antiferromagnetic state. The magnetic measurements reveal a significant enhancement of the ferromagnetic ordering in the La0,9Ca0,1MnO3 layers due to a strong magnetic coupling between the constituent sublayers. The multilayer film shows the anisotropic saturation magnetization at low temperature and the alternating shape of the temperature-dependent anisotropic magnetoresistance near the metal - insulator transition.The magnetotransport properties of Pr0,5Ca0,5MnO3/La0,7Sr0,3MnO3 bilayer, and Pr0,5Ca0,5MnO3 and La0,7Sr0,3MnO3 films, deposited on LaAlO3 (001) substrate by pulse laser deposition have been investigated. The x-ray diffraction and high-resolution electron-microscopy analysis reveals that lattice parameters for the constituent sublayers in the bilayer are very close to that for the individual films. It was found that a ferromagnetic transition in the La0,7Sr0,3MnO3 sublayer significantly modifies the magnetotransport properties of the Pr0,5Ca0,5MnO3 constituent sublayer, owing to occurrence of a magnetic proximity effect. The main evidences for this effect are an appearance of the exchange bias interaction between the constituent sublayers; a localized-to-itinerant crossover in the system of polarized electrons, which results in formation of the Griffiths-like ferromagnetic state; and an unusual polaron transport of carriers. The experimental results have been analyzed within the framework of modern theoretical approaches.
Цитованість авторів публікації:Prokhorov V.Kaminsky G.
Flis V.
Kim J.
Eom T.
Park J.
Lee Y.
Svetchnikov V.
Бібліографічний опис для цитування: Prokhorov V. G. Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films / V. G. Prokhorov, G. G. Kaminsky, V. S. Flis, J. M. Kim, T. W. Eom, J. S. Park, Y. P. Lee, V. L. Svetchnikov // Физика низких температур. - 2012. - Т. 38, № 1. - С. 52-61. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2012_38_1_9.
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