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- Title
Large magnetoresistance in carbon-coated Ni/NiO nanoparticles.
- Authors
Roy, Subir; Katoch, Rajesh; Angappane, S
- Abstract
We report here a large magnetoresistance (MR) observed in carbon-coated Ni/NiO nanostructures synthesized by a chemical method. The crystalline nature and particle size of the graphitic-carbon-coated Ni/NiO nanostructure was investigated by X-ray diffraction study and field emission scanning electron microscope images. The Raman spectroscopy confirms the presence of graphite layer over the Ni/NiO nanostructure. The field-cooled (FC) magnetic hysteresis curves show exchange bias effect suggesting possible Ni/NiO core-shell structure. The temperature-dependent magnetization data show bifurcation in FC-zero-field-cooled curves, indicating the superparamagnetic behaviour and competing ferromagnetic (FM) and antiferromagnetic interactions in the nanocomposite. MR studies show a large negative MR of ∼<inline-graphic></inline-graphic>20% at 18 K and ∼<inline-graphic></inline-graphic>4.2% at room temperature, revealing significant enhancement of FM interactions at low temperatures and spin-dependent tunnelling of current through the nanocomposite.
- Subjects
MAGNETORESISTANCE; ELECTRIC resistance; CARBON compounds; NANOPARTICLES; NANOSTRUCTURED materials
- Publication
Bulletin of Materials Science, 2018, Vol 41, Issue 5, p1
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-018-1645-8