SEMINAR: Physics Seminar

There is currently an intense interest in the magnetic properties of nanoscale and sub-micron discs of low aspect ratio. Such discs have potential applications in data storage, magneto-electronics and spintronics, and medicine, and are otherwise viewed as simple model systems by which the properties of more exotic nanostructures can be understood.

In this talk I present some of the key results from my PhD work into the effect of disorder on arrays of such discs. I describe the fabrication of partially disordered arrays of sub-micron diameter, nanometer thickness magnetic discs by a nanosphere lithographic technique, and the characterisation of these arrays by vector network analyser ferromagnetic resonance. Characterisation is performed for two particular magnetisation geometries, and the mode structure and linewidth broadening in both geometries related to varied degrees of array ordering in the samples.