Probing submicron nanomagnets by magneto-optics

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Abstract
A hybrid magneto-optical magnetometer and optical microscope has been designed and constructed for probing the magnetic properties of submicron nanomagnets. 10-nm-thick square nanomagnets have been fabricated individually and in small arrays from Ni80Fe14Mo5 (“supermalloy”) by electron-beam lithography. Hysteresis loops with a good signal-to-noise ratio have been obtained from individual nanomagnets as small as 400 nm and from (5 μm)2 arrays of nanomagnets ranging in size from 500 to 75 nm.