Magnetic State Estimator to Characterize the Magnetic States of Nano-Magnetic Disks

We present an image processing system-magnetic state estimator (MSE) to estimate the magnetization states of lithographically patterned single domain nano-magnets. The tool requires digital images of a magnetic force micrograph, an atomic force micrograph and a computer-aided design layout of the magnetic nanostructures to estimate their magnetization states. The tool also yields a confidence value of the estimated magnetization state. We have tested the MSE on randomly patterned Permalloy nano-magnetic disks on a Silicon wafer. The tool was able to correctly identify 403 single domain states out of 499 and 256 vortex states out of 297, producing an accuracy rate of 83%.