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Magnetoresistance Effects in Carbon-Based Nanostructures Open Access


Other title
Magnetoresistance (MR)
Multilayer Graphene (MLG)
Multiwall Carbon Nanotube (MWCNT)
Spin Valve
Anodic Alumina Oxide (AAO)
Raman Spectroscopy
Interlayer Magnetoresistance (ILMR)
Type of item
Degree grantor
University of Alberta
Author or creator
Singh, Abhay Pratap
Supervisor and department
Pramanik, Sandipan (Department of Electrical and Computer Engineering)
Examining committee member and department
Vaidyanathan, Mani (Department of Electrical and Computer Engineering)
Jacob, Zubin (Department of Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Microsystems and Nanodevices
Date accepted
Graduation date
Master of Science
Degree level
Magnetoresistance (MR) effect is extensively used in state-of-the-art magnetic field sensing and data storage devices. In this work, we present (a) current-perpendicular-to-plane (CPP) MR effect in multilayer graphene (MLG) grown on cobalt (Co) foil and (b) spin valve MR effect in a vertical array of multiwall carbon nanotube (MWCNT) spin valves. In part (a) strong room-temperature CPP-MR effects have been observed in as-grown MLG on Co. The origin of the MR effect lies in the graphene-Co interface and interlayer coupling between the graphene layers of MLG. In part (b) an array of vertically standing MWCNT spin valves has been synthesized in the pores of an anodic alumina template. A spin valve MR and spin relaxation length of ~ 0.28 μm have been observed at 8 K, which disappears at higher temperature. This indicates necessity of alternative designs for room temperature operation of MWCNT spin valves.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
K. M. Alam, A. P. Singh, S. C. Bodepudi, and S. Pramanik, “Fabrication of hexagonally ordered nanopores in anodic alumina: An alternative pretreatment,” Surf. Sci., vol. 605, no. 3–4, pp. 441–449, Feb. 2011.A. P. Singh, S. C. Bodepudi, K. Alam, and S. Pramanik, “High Density Integration of Carbon Nanotube Spin Valves,” in 2011 International Conference on Nanoscience, Technology and Societal Implications (NSTSI), 2011, pp. 1–4.S. Bodepudi, A. Singh, and S. Pramanik, “Current-Perpendicular-to-Plane Magnetoresistance in Chemical Vapor Deposition-Grown Multilayer Graphene,” Electronics, vol. 2, no. 3, pp. 315–331, Sep. 2013.

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