Spatiotemporal Near-Field Spin Microscopy in Patterned Magnetic Heterostructures

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Abstract
Low temperature femtosecond-resolved near-field scanning optical microscopy is used to image excitonic spin behavior in locally disordered magnetic semiconductor heterostructures. A contrast between luminescence intensity and polarization profiles yields marked differences between carrier diffusion and spin transport over a spin-dependent energy landscape sharply defined by focused ion beam implantation. Space-time spectroscopies reveal a spin component to the exciton evolution in the presence of a magnetic field. Fundamental limitations on the measurement of circularly polarized luminescence in the near field are also demonstrated.