8 October 2004 Cavity-enhanced near-field optical magnetometry
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Abstract
We present the first near-field scanning optical magneto-optic Kerr effect (MOKE) of sub-micron magnetic structures, where a Kerr rotation of 0.11° from a 0.25μm nickel magnet was observed. This is enabled by a cavity based technique to enhance the Kerr rotation of light reflected from a magnetized surface. Spatially resolved magneto-optic measurements are performed involving both conventional microscopy and near-field scanning optical microscopy (NSOM). Cavity enhancement is achieved with either a single dielectric coating or a dielectric-metal bilayer coating applied to the ferromagnetic structure of interest. We present a scattering matrix approach to calculating the enhancement resulting from a multilayer dielectric coating and show good agreement with experiment. This demonstrates a non-invasive optical technique for magnetometry with ultrahigh spatial resolution.
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Naser Qureshi, Naser Qureshi, Aaron R. Hawkins, Aaron R. Hawkins, Holger Schmidt, Holger Schmidt, } "Cavity-enhanced near-field optical magnetometry", Proc. SPIE 5515, Nanoengineering: Fabrication, Properties, Optics, and Devices, (8 October 2004); doi: 10.1117/12.559681; https://doi.org/10.1117/12.559681
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