Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152597 | Journal of Magnetism and Magnetic Materials | 2018 | 8 Pages |
Abstract
Manganese added nickel oxide composite nanoparticles (1â¯ââ¯x)NiO-xMnO2 (xâ¯=â¯0.00, 0.5, 0.10, 0.15 & 1.0) were prepared using mechanical milling and subjected to different characterization techniques to study their structural, optical and magnetic properties. The microstructures, surface morphology, crystallite size of the nanoparticles were studied using X-ray diffractometer (XRD), field emission scanning electron microscopy (FE-SEM). From these it was found that the nanoparticles were in cubic structure. Secondary phases were observed with increase of Mn concentration. The crystallite size of the particles was calculated using Scherer's relation and found that the nanoparticles were in the range of 25-35â¯nm. The magnetic properties of the composite nanoparticles were studied at room temperature and at 100â¯K using vibrating sample magnetometer (VSM) in the applied field range of ±75â¯kOe. The MnO2 nanoparticles exhibited paramagnetic nature at room temperature. The NiO nanoparticles exhibited soft ferromagnetic nature and strength of magnetization increased with applied external magnetic field (±50â¯kOe). The Mn doped nickel oxide composite nanoparticles also exhibited soft ferromagnetism at room temperature and at 100â¯K. The strength of magnetization increased with increase of Mn concentration and the composite nanoparticles at xâ¯=â¯0.15 (Ni0.85Mn0.15O) shown the highest magnetic moment of 6â¯emu/g at 100â¯K. The temperature dependent magnetic moments for (1â¯ââ¯x)NiO-xMnO nanoparticles at different x values were also discussed in detail.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
B. Balaraju, S. Kaleemulla, C. Krishnamoorthi,