Magneto-Optical Spectrum Analyzer
  We present a method for the investigation of gigahertz magnetization dynamics of single magnetic nano elements. By combining a frequency domain approach with a micro focus Kerr effect detection, a high sensitivity to magnetization dynamics with submicron spatial resolution is achieved. It allows spectra of single nanostructures to be recorded. Results on the uniform precession in soft magnetic platelets are presented. 
Mathias Helsen and Ajay Gangwar and Arne Vansteenkiste and Bartel   Vanwaeyenberge
physics.ins-det physics.optics