Influence of Al2O3 on the low-field magnetoresistance of sol–gel grown La0.67Ca0.33MnO3:Al2O3 nanocomposites

Lau, Lik Nguong; Lim, Kean Pah; Ngai, L. M.; Ishak, Amirah Natasha; Kechik, Mohd Mustafa Awang; Chen, Soo Kien; Ibrahim, Noor Baa`Yah; Shaari, Abdul Halim

doi:10.1007/s00339-020-03924-5

Cited by 1 publication

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“…Additionally, the TMI appeared to shift towards the lower temperature region with the increasing content of NiO in LCMO composites. The same behaviour was reported in our previous work for LCMO: Al2O3 composites [22]. This shift is caused by the segregation of NiO nanoparticles near the LCMO grains or grain boundaries of the composites.…”

Section: Resultssupporting

confidence: 89%

“…From their study, the composites with high NiO content demonstrated the reduction in LFMR, originating from the substitution of Ni 2+ with the Mn 3+ and causing the magnetic dilution. Besides the concentration of the secondary phase, the spin polarised tunnelling responsible for LFMR could also be restricted by the nanosized parent compound, which was proposed in our previous work for LCMO: Al 2 O 3 [22].…”

Section: Introductionmentioning

confidence: 66%

“…Most samples in this work (x = 0.00, 0.05 and 0.10) showed a distinct metal-insulator transition in the range of 80-180 K. The metal-insulator transition temperature (TMI) shifted to a higher temperature under the influence of a magnetic field. This effect is attributed to the alignment of localised spin in manganite and leads to the reduction in electron scattering, thus enhance the DE coupling in the metallic region [22,29]. Additionally, the TMI appeared to shift towards the lower temperature region with the increasing content of NiO in LCMO composites.…”

Section: Resultsmentioning

confidence: 94%

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Effect of NiO Nanoparticle Addition on the Structural, Microstructural, Magnetic, Electrical, and Magneto-Transport Properties of La0.67Ca0.33MnO3 Nanocomposites

et al. 2021

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Incorporation of the secondary oxide phase into the manganite composite capable of enhancing low-field magnetoresistance (LFMR) for viability in high-performance spintronic applications. Polycrystalline La0.67Ca0.33MnO3 (LCMO) was prepared via the sol–gel route in this study. The structural, microstructural, magnetic, electrical, and magneto-transport properties of (1−x) LCMO: x NiO, x = 0.00, 0.05, 0.10, 0.15 and 0.20 were investigated in detail. The X-ray diffraction (XRD) patterns showed the coexistence of LCMO and NiO in the composites. The microstructural analysis indicated the amount of NiO nanoparticles segregated at the grain boundaries or on the surface of LCMO grains increased with the increasing secondary phase content. LCMO and NiO still retained their individual magnetic phase as observed from AC susceptibility (ACS) measurement. This further confirmed that there is no interfacial diffusion reaction between these two compounds. The NiO nanoparticle acted as a barrier to charge transport and caused an increase in resistivity for composite samples. The residual resistivity due to the grain/domain boundary is responsible for the scattering mechanism in the metallic region as suggested by the theoretical model fitting, ρ(T)=ρ0+ρ2T2+ρ4.5T4.5. The magnetoresistance values of LCMO and its composites were found to increase monotonically with the decrease in temperature. Hence, the LFMR was observed. Nonetheless, the slight reduction of LFMR in composites was attributed to the thick boundary layer created by NiO and impaired the spin polarised tunnelling process.