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Nano Lett. 2005 Jul;5(7):1413-7.

Cavity-enhanced magnetooptical observation of magnetization reversal in individual single-domain nanomagnets.

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  • 1School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA.


Optical studies of nanoscale magnets promise access to ultrafast magnetization dynamics but are challenging because of limited spatial resolution. We demonstrate that cavity enhancement of the magnetooptical Kerr effect increases the sensitivity in nanomagnetooptics significantly. Magnetization switching in individual single-domain magnets in both far-field and near-field Kerr microscopy is observed, and scaling laws are determined. Near-field signals remain nearly constant with reduced magnet diameter, indicating favorable scaling of near-field magnetooptics into the deep nanometer range.

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