Magnetoresistive properties of thin nanostructured manganite films grown by metalorganic chemical vapour deposition onto glass-ceramics substrates

The results of fabrication of nanostructured La 1− x Sr x MnO 3 films grown by pulsed injection metalorganic chemical vapour deposition technique onto special disordered glass-ceramics substrate are presented. Two groups of films were produced in order to determine what would be their main physical...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2018-09, Vol.53 (18), p.12996-13009
Main Authors: Zurauskiene, N., Balevicius, S., Stankevic, V., Kersulis, S., Klimantavicius, J., Plausinaitiene, V., Kubilius, V., Skapas, M., Juskenas, R., Navickas, R.
Format: Article
Language:English
Subjects:
Analysis
Anisotropy
Ceramics
Characterization and Evaluation of Materials
Chemical vapor deposition
Chemistry and Materials Science
Classical Mechanics
Colossal magnetoresistance
Columnar structure
Crystallites
Crystallography and Scattering Methods
Electric properties
Electronic Materials
Flux density
Glass ceramics
Glass substrates
Grain boundaries
Magnetic fields
Magnetic flux
Magnetic properties
Magnetism
Magnetoresistance
Magnetoresistivity
Manganites
Materials Science
Morphology
Nanostructure
Organic chemistry
Physical properties
Polymer Sciences
Sensors
Solid Mechanics
Thickness
Thin films
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The results of fabrication of nanostructured La 1− x Sr x MnO 3 films grown by pulsed injection metalorganic chemical vapour deposition technique onto special disordered glass-ceramics substrate are presented. Two groups of films were produced in order to determine what would be their main physical properties when certain fabrication changes were introduced: (1) films with thicknesses in the range of 25–900 nm, which were grown at a temperature of 750 °C; and (2) films having thicknesses of 400 nm, which were grown at different deposition temperatures ranging from 600 °C up to 775 °C in steps of 25 °C. It was determined that the morphology and microstructure of the films depends on the thicknesses of these films and their deposition temperatures. The thinnest films (25 nm) grew mainly in amorphous phase, while the thicker films had well-pronounced structure made of column-shaped crystallites. These had average column widths of 40–65 nm, were spread throughout the whole thickness of the films, and were separated by 5–10-nm-thick grain boundaries. The influence of growth conditions on the colossal magnetoresistance effect in these films was studied in pulsed magnetic fields of up to 20 T. The dependences of the magnetoresistance on the magnetic flux density were analysed using modified Mott’s hopping model. It was demonstrated that these nanostructured films behave as superparamagnetic materials with reduced magnetic properties due to disordered grain boundaries. The obtained results allow the tuning of the resistivity, magnetoresistance and the anisotropy of La 1− x Sr x MnO 3 manganite films, which were deposited onto glass-ceramic substrates, and thus to use them for the fabrication of high pulsed magnetic field sensors.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-018-2567-y