Elastically strained and relaxed La0.67Ca0.33MnO3 films grown on lanthanum aluminate substrates with different orientations

• Published in: Physics of the solid state Vol. 58; no. 12; pp. 2560 - 2566
• Main Authors: Boikov, Yu. A., Serenkov, I. T., Sakharov, V. I., Claeson, T.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-12-2016; Springer Nature B.V
• Subjects: anisotropic magnetoresistance; energy ion-scattering; magnetic-properties; magnetotransport; microstructure; perovskite; Physics; Physics and Astronomy; single-crystals; Solid State Physics; Surface Physics and Thin Films; Thick films; thin-films; transition; transport
• ISSN: 1063-7834; 1090-6460; 1090-6460
• DOI: 10.1134/S1063783416120039

Structure of 40-nm thick La
0.67
Ca
0.33
MnO
3
(LCMO) films grown by laser evaporation on (001) and (110) LaAlO
3
(LAO) substrates has been investigated using the methods of medium-energy ion scattering and X-ray diffraction. The grown manganite layers are under lateral biaxial compressive mechanical stresses. When (110)LAO wafers are used as the substrates, stresses relax to a great extent; the relaxation is accompanied by the formation of defects in a (3–4)-nm thick manganite-film interlayer adjacent to the LCMO–(110)LAO interface. When studying the structure of the grown layers, their electro- and magnetotransport parameters have been measured. The electroresistance of the LCMO films grown on the substrates of both types reached a maximum at temperature
T
M
of about 250 K. At temperatures close to
T
M
magnetoresistance of the LCMO/(110)LAO films exceeds that of the LCMO/(001)LAO films by 20–30%; however, the situation is inverse at low temperatures (
T
< 150 K). At
T
<
T
M
, the magnetotransport in the grown manganite films significantly depends on the spin ordering in ferromagnetic domains, which increase with a decrease in temperature.