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Magnetic domain evolution in permalloy mesoscopic dots

Hirohata, A., Leung, H.T., Xu, Y.B., Yao, C.C., Lee, W.Y., Bland, J.A.C. and Holmes, S.N. (1999) Magnetic domain evolution in permalloy mesoscopic dots. IEEE Transactions on Magnetics. pp. 3886-3888. ISSN 1941-0069

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Permalloy (Ni80Fe20) squares (30 nm thick and w mu m wide; 1 less than or equal to w less than or equal to 200 mu m) and circular disks (30 nm thick and r mu m diameter; 1 less than or equal to r less than or equal to 200 mu m) prepared on a GaAs (100) substrate were observed in both their demagnetized and remanent states by magnetic force microscopy (MFM) associated with non-contact atomic force microscopy (NC-AFM). The squares (2 less than or equal to w mu m) exhibited conventional closure domains and the corner plays a very important role in creating new walls. The circular disks, on the other hand, formed either vortex domain (5 less than or equal to r less than or equal to 20 mu m) or multi-domain (50 less than or equal to r mu m) states, The magnetization rotation is observed by MFM to change according to the size and shape of the elements, The MFM observations are supported by micromagnetic calculations which confirm the effect of the corner on the domain wall formation.

Item Type: Article
Copyright, Publisher and Additional Information: © 1999 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.
Keywords: mesoscopic structures,magnetic force microscopy,micromagnetic calculation,magnetic domain evolution
Institution: The University of York
Academic Units: The University of York > Electronics (York)
Depositing User: Repository Officer
Date Deposited: 18 Dec 2006
Last Modified: 12 Jun 2016 13:29
Published Version: http://dx.doi.org/10.1109/20.800697
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/1853

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