Magnetotransport characteristics of strained La{sub 0.7}Sr{sub 0.3}MnO{sub 3} epitaxial manganite films

Journal Article · Wed Jan 14 23:00:00 EST 2009 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776109010075· OSTI ID:21246971

Petrzhik, A M; Borisenko, I V; Klimov, A A; Ignatov, Yu A; Demidov, V V; Nikitov, S A ^[1]

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1. Russian Academy of Sciences, Institute of Radio-Engineering and Electronics (Russian Federation)

The electrical and magnetic characteristics of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} (LSMO) epitaxial manganite films are investigated by different methods under conditions when the crystal structure is strongly strained as a result of mismatch between the lattice parameters of the LSMO crystal and the substrate. Substrates with lattice parameters larger and smaller than the nominal lattice parameter of the LSMO crystal are used in experiments. It is shown that the behavior of the temperature dependence of the electrical resistance for the films in the low-temperature range does not depend on the strain of the film and agrees well with the results obtained from the calculations with allowance made for the interaction of electrons with magnetic excitations in the framework of the double-exchange model for systems with strongly correlated electronic states. Investigations of the magneto- optical Kerr effect have revealed that an insignificant (0.3%) orthorhombic distortion of the cubic lattice in the plane of the NdGaO{sub 3}(110) substrate leads to uniaxial anisotropy of the magnetization of the film, with the easy-magnetization axis lying in the substrate plane. However, LSMO films on substrates (((LaAlO{sub 3}){sub 0.3}+(Sr{sub 2}AlTaO{sub 6}){sub 0.7})(001)) ensuring minimum strain of the films exhibit a biaxial anisotropy typical of cubic crystals. The study of the ferromagnetic resonance lines at a frequency of 9.76 GHz confirms the results of magnetooptical investigations and indicates that the ferromagnetic phase in the LSMO films is weakly inhomogeneous.

• OSTI ID: 21246971
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 1 Vol. 108; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
ANISOTROPY
CRYSTAL GROWTH
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRONS
EPITAXY
FERROMAGNETIC RESONANCE
FILMS
GHZ RANGE
KERR EFFECT
LANTHANUM COMPOUNDS
LATTICE PARAMETERS
MAGNETIZATION
MANGANATES
ORTHORHOMBIC LATTICES
PERIPHERAL MODELS
STRONTIUM COMPOUNDS
SUBSTRATES
TEMPERATURE DEPENDENCE