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Mesoscovic magnetic/semiconductor heterostructures

Xu, Yong Bing, Ahmad, Ehsan, Lu, Yong Xiong, Claydon, Jill S., Zhai, Ya and van der Laan, Gerrit (2006) Mesoscovic magnetic/semiconductor heterostructures. IEEE Transactions on Nanotechnology. pp. 455-458. ISSN 1536-125X

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We report the experimental results of Fe and Fe3O4 nanostructures on GaAs(100) surfaces and hybrid Ferromagnetic/Semiconductor/Ferromagnetic (FM/SC/FM) spintronic devices. Element specific x-ray magnetic circular dichroism (XMCD) measurements have shown directly that Fe atoms on the GaAs(100)-4 x 6 surface are ferromagnetic. Within coverages of 2.5 to 4.8 ML superparamagnetic nanoclusters are formed and exhibiting strong uniaxial anisotropy, of the order of 6.0 x 10(5) erg/cm(3). The coercivities of epitaxial Fe dot arrays films grown on GaAs(100) were observed to be dependent on the separation and size of the dots indicating that interdot dipolar coupling affects the magnetization processes in these dots. In addition Fe3O4 films grown on deformed GaAs(100) substrates have been observed to form nanostripes following the topography of the substrate and magneto-optical Kerr effect (MOKE) measurements showed that these nanostripes have uniaxial magnetic anisotropy with easy axis perpendicular to the length of the nanostripes. Meanwhile the FM/SC/FM vertical device has exhibited a biasing current dependent on MR characteristics, with a maximum change of 12% in the MR observed, indicating for the first time a large room temperature spin injection and detection.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 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: epitaxial ferromagnetic thin film,ferromagnetic/semiconductor hybrid structures,spintronics,FE FILMS,ELECTRONICS
Institution: The University of York
Academic Units: The University of York > Electronics (York)
Depositing User: Repository Officer
Date Deposited: 18 Dec 2006
Last Modified: 19 Apr 2016 07:08
Published Version: http://dx.doi.org/10.1109/TNANO.2006.880415
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/1848

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