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Tuning the surface anisotropy in Fe-doped NiO nanoparticles.
K O Moura1, R J S Lima, A A Coelho
1Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, 13083-859, Campinas, SP, Brazil.
Nanoscale
|November 8, 2013
Summary
Iron doping in nickel oxide (Ni(1-x)FexO) nanoparticles influences magnetic properties. Increased iron content enhances low-temperature magnetic peaks and exchange bias effects, linked to surface anisotropy.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Nickel oxide (NiO) is a p-type semiconductor with interesting magnetic and electrical properties.
- Nanoparticles offer unique characteristics due to their high surface area-to-volume ratio.
- Doping can tune the properties of materials for specific applications.
Purpose of the Study:
- To synthesize and characterize Ni(1-x)FexO nanoparticles.
- To investigate the effect of iron (Fe) doping on the structural and magnetic properties of NiO nanoparticles.
- To understand the relationship between Fe concentration, surface anisotropy, and observed magnetic behaviors.
Main Methods:
- Co-precipitation chemical route for nanoparticle synthesis.
- X-ray diffraction (XRD) with Rietveld refinement for structural analysis.
- Zero-field-cooling (ZFC) and field-cooling (FC) magnetization measurements to study magnetic transitions.
- Analysis of coercive field and exchange bias effects.
Main Results:
- Synthesized Ni(1-x)FexO nanoparticles with varying Fe content.
- Observed a decrease in microstrain and particle size with increasing Fe concentration.
- Demonstrated superparamagnetic behavior at high temperatures and a distinct low-temperature peak (at 11 K) enhanced by Fe doping.
- Reported unusual coercive field behavior and significant exchange bias, which increases with decreasing Fe content.
Conclusions:
- Fe incorporation in NiO nanoparticles modifies structural and magnetic properties.
- The observed magnetic phenomena, including exchange bias, are attributed to strengthened surface anisotropy due to Fe ion incorporation.
- These findings suggest potential for tuning magnetic properties of NiO nanoparticles through controlled doping.
