Wide temperature range magnetoresistance enhancement of La0.67Ca0.33MnO3: NiO nanocomposites

This paper reports the addition of NiO nanoparticles into the LCMO nanocomposites through a simplified methodology in the heat treatment process compared to the previous work. Structural analysis showed that LCMO and NiO co-existed in the samples without the formation of other phases and confirmed t...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2023-04, Vol.129 (4), Article 297
Main Authors: Lau, L. N., Hon, X. T., Wong, Y. J., Lim, K. P., Kamis, N. H., Kechik, M. M. Awang, Chen, S. K., Ibrahim, N. B., Shabdin, M. K., Miryala, M., Shaari, A. H.
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Composite structures
Condensed Matter Physics
Curie temperature
Ferromagnetism
Grain boundaries
Grain size distribution
Heat treatment
Machines
Magnetoresistance
Magnetoresistivity
Manufacturing
Materials science
Metal-insulator transition
Nanocomposites
Nanoparticles
Nanotechnology
Nickel oxides
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Structural analysis
Surfaces and Interfaces
Temperature
Temperature dependence
Thin Films
Transition temperature
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Summary:This paper reports the addition of NiO nanoparticles into the LCMO nanocomposites through a simplified methodology in the heat treatment process compared to the previous work. Structural analysis showed that LCMO and NiO co-existed in the samples without the formation of other phases and confirmed their composite structures. The grain size distribution of samples was observed to become narrower and left-skewed as the concentration of NiO nanoparticles increased. This indicates that the NiO nanoparticles were distributed near the grain boundaries or on the grain surfaces. The presence of La, Ca, Mn, O, and Ni was confirmed by EDX analysis, and no additional impurities were noticeable, which revealed that the composites here are chemically pure in the composition. Temperature dependence magnetisation measurement (100–300 K) revealed the occurrence of ferromagnetic to paramagnetic transition. The Curie temperature, T C recorded at 260 K for all samples. However, the metal–insulator transition temperature, T MI was found to decrease from 246 to 120 K as the NiO content increased. Magnetoresistance of composites was observed to enhance over a wide temperature range at 10 kOe. The findings of LCMO: NiO composites in this work can set up a new perspective and unlock its potential to be utilised in magnetic field sensor element functioning at a wide range of temperatures.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-023-06584-3