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Enhanced longitudinal magnetooptic Kerr effect contrast in nanomagnetic structures\ud \ud

By U.J. Gibson, L.F. Holiday, D.A. Allwood, S. Basu and P.W. Fry

Abstract

We report on enhanced longitudinal magnetooptic Kerr effect signal contrast in thin-film nanomagnetic disks with in-plane magnetization when combined with dielectric layers that provide impedance matching to the structure and the underlying substrate. Kerr signals can increase by a factor of three, while substrate reflectance is almost completely suppressed. This leads to an increase in Kerr ellipticity relative to the background intensity and a subsequent improvement in the measured signal-to-noise ratio. Measurements using a beam focused on opaque 400-nm Ni disks yield contrast improvements of a factor of 8. Arrays of nanodisks demonstrate more complex behavior due to diffraction effects

Publisher: IEEE
Year: 2007
OAI identifier: oai:eprints.whiterose.ac.uk:3366

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