Kamis, Nur Hamizah (2022) Effect of nio addition on structural, magnetic, electrical and magneto-transport properties of La0.67Ca0.33MnO3 (LCMO) composites. [Project Paper] (Submitted)
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Abstract
Magnetic resistance is the ability of an electrical resistance to change its value when an external magnetic field is applied. The inspiration to perform research on substantial magnetic resistance was triggered by the concept of usage in magnetoresistive transducers and sensor-triggered systems. Previous conducted research established that considerable MR can be created at low temperatures by introduce artificial grain boundaries. Numerous studies have been undertaken to evaluate magnetoresistivity’s intrinsic features, but few have examined its extrinsic impacts. Numerous investigations have been undertaken to increase the effects of extrinsic magnetic resistance, either by modifying the production method and pathway or through adding oxide compounds as artificial surfaces. The main objective of the research was to determine the effect of adding NiO to (1-x) LCMO: x NiO by the sol-gel method for x = 0.00, 0.01, 0.03, 0.05, and 0.10. Microstructural analyses demonstrated an increase in the number of NiO segregated at the grain border or on the LCMO grain surface as the secondary phase concentration increased. Thermogravimetric Analysis (TGA), X-ray diffractometer (XRD), AC Susceptometer (ACS), Hall Effect Measurement System (HMS), and Vibrating Sample Magnetometer (VSM) were utilised to characterise the material's electrical transport, structural, and magnetic properties. Crystallite size formation remain similar as NiO is added in the system. The TGA demonstrates a three-step process, with the first stage demonstrating water evaporation, the second stage demonstrating the importance of water in polymer decomposition, and the third stage indicating the creation of oxides and evaporated oxygen phases. At room temperature, all samples exhibited a paramagnetic phase, and the M–H graph demonstrated a reduction in magnetism with increasing secondary phase concentration. TMI has been demonstrated to be suppressed in composites due to the grains inability to connect. According to the electrical characteristics, the resistance increases with the addition of NiO due to an increase in spin dependent tunnelling scattering across the NiO layer's artificial grain boundary. The magnetic field-dependent MR curve clearly demonstrates that the inclusion of NiO as an artificial grain boundary enhances the external magnetic resistance at various temperatures.
| Item Type: | Project Paper |
|---|---|
| Faculty: | Fakulti Sains |
| Depositing User: | Ms Emelda Mohd Hamid |
| Date Deposited: | 08 May 2024 04:02 |
| Last Modified: | 08 Aug 2024 06:15 |
| URI: | http://psaspb.upm.edu.my/id/eprint/1743 |
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