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Enhanced longitudinal magnetooptic Kerr effect contrast in nanomagnetic structures

Gibson, U.J., Holiday, L.F., Allwood, D.A., Basu, S. and Fry, P.W. (2007) Enhanced longitudinal magnetooptic Kerr effect contrast in nanomagnetic structures. IEEE Transactions on Magnetics, 43 (6). pp. 2740-2742. ISSN 0018-9464


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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.

Item Type: Article
Copyright, Publisher and Additional Information: © Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
The University of Sheffield > University of Sheffield Research Centres and Institutes > Centre for Nanoscience and Technology (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 14 Sep 2007 15:39
Last Modified: 06 Jun 2014 20:20
Published Version: http://dx.doi.org/10.1109/TMAG.2007.894003
Status: Published
Publisher: IEEE
Refereed: Yes
Identification Number: 10.1109/TMAG.2007.894003
URI: http://eprints.whiterose.ac.uk/id/eprint/3366

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