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Magnetoresistance MR, Multilayer Graphene MLG, Multiwall Carbon Nanotube MWCNT, Spin Valve, Anodic Alumina Oxide AAO, Raman Spectroscopy, Interlayer Magnetoresistance ILMR

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: Department of Electrical and Computer Engineering

Specialization: Microsystems and Nanodevices

Date accepted: 2013-12-05T14:13:20Z

Graduation date: 2014-06

Degree: Master of Science

Degree level: Master's

Abstract: 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.

Language: English

DOI: doi:10.7939-R3JS9HF5M

Rights: 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.

Autor: Singh, Abhay Pratap



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