Microscopic magnetic behavior of supported nanoparticles is strongly correlated with their functionalities, especially in data storage and biological applications, but still needs to be clarified. We studied nanoscale magnetic configurations of Fe nanoparticle assemblies using scanning electron microscopy with polarization analysis. The flux closure domain configurations and the reduced magnetic correlation length (∼250nm), relative to the conventional thin films, are determined. Quantitative analysis indicates the magnetic interaction energy to be 80-99 meV, close to the magnetic dipolar coupling energy. These direct observations evidence the aforereported simulations and will be valuable for fabricating magnetic nanoparticle assemblies with the desired magnetic properties.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2009 Aug 6|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics