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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
Published on: February 5, 2022
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Ferromagnetic ordering in Mn-doped ZnO nanoparticles
Xi Luo1, Wai-Tung Lee2, Guozhong Xing1
1School of Materials Science and Engineering, University of New South Wales, Kensington, 2 High Street, Sydney, NSW 2052, Australia.
Nanoscale Research Letters
|December 2, 2014
Summary
Synthesized zinc manganese oxide nanoparticles exhibit room-temperature ferromagnetism. This magnetism vanishes after annealing, highlighting the critical role of post-treatment in nanostructured magnetic semiconductors.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Diluted magnetic semiconductors (DMS) are promising for spintronic applications.
- Zinc oxide (ZnO) is a potential host material for DMS due to its wide bandgap.
- Controlling magnetic properties in ZnO-based DMS is crucial for device fabrication.
Purpose of the Study:
- To synthesize and characterize zinc manganese oxide (Zn1-xMnxO) nanoparticles.
- To investigate the effect of manganese (Mn) doping on the structural and magnetic properties of ZnO nanoparticles.
- To explore the influence of post-annealing treatments on the observed ferromagnetism.
Main Methods:
- Hydrothermal synthesis technique for Zn1-xMnxO nanoparticle preparation.
- Electron spin resonance (ESR) and synchrotron X-ray diffraction (XRD) for structural and phase analysis.
- Magnetic property measurements at room temperature.
Main Results:
- Zn1-xMnxO nanoparticles were successfully synthesized with Mn doping up to 9 at% without secondary phases.
- Room-temperature ferromagnetism was observed in the as-prepared nanoparticles.
- The ferromagnetism disappeared after post-annealing in argon or air atmospheres.
Conclusions:
- Manganese doping in ZnO nanoparticles can induce room-temperature ferromagnetism.
- Post-treatment conditions significantly impact the magnetic properties of nanostructured magnetic semiconductors.
- Careful control of annealing is essential for realizing stable magnetic functionalities in Zn1-xMnxO nanoparticles for potential spintronic applications.
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