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Spin-Valve Behavior in Aligned Arrays of Carbon Nanotubes

Murphey, Mark Benjamin
http://rave.ohiolink.edu/etdc/view?acc_num=osu1267764111

Abstract Details

2010, Doctor of Philosophy, Ohio State University, Physics.
We report the operation of spin-valve structures formed from aligned arrays of multi-walled carbon nanotubes up to 10 μm in length. The devices require only one additional ferromagnetic layer with the ferromagnetic catalyst nanoparticles of either iron or cobalt serving as the other magnetic electrode. Peaks in the resistance occur clearly as a result of the reversal of the magnetization of the electrodes. Several variations of this structure are examined: spin-valve structures formed from arrays of aligned carbon nanotubes with internal iron catalyst nanoparticles, a protective SiO2 cover layer, and directly-deposited iron films; arrays grown and embedded in porous anodized aluminum oxide, incorporating cobalt nanoparticles and directly-deposited iron films; and spin-valves constructed from nearly-fully-spin-polarized films of La2/3Sr1/3MnO3 (LSMO) and containing iron nanoparticles. We have observed spin-dependant transport in these devices with maximum observed magnetoresistances ranging from 1.5% for aluminum oxide grown devices to in excess of 30% in LSMO-based devices. Spin diffusion lengths in these multi-walled carbon nanotube arrays are calculated to be at least 15.6 μm.
Arthur Epstein, PhD (Advisor)
Jay Gupta, PhD (Committee Member)
Michael Poirier, PhD (Committee Member)
John Wilkins, PhD (Committee Member)
73 p.
Physics
carbon nanotubes; spin-valves

Recommended Citations

Citations

  • Murphey, M. B. (2010). Spin-Valve Behavior in Aligned Arrays of Carbon Nanotubes [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267764111

    APA Style (7th edition)

  • Murphey, Mark. Spin-Valve Behavior in Aligned Arrays of Carbon Nanotubes. 2010. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1267764111.

    MLA Style (8th edition)

  • Murphey, Mark. "Spin-Valve Behavior in Aligned Arrays of Carbon Nanotubes." Doctoral dissertation, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267764111

    Chicago Manual of Style (17th edition)

osu1267764111
748
© 2010, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.