Conference proceeding
A new twist on organic spintronics; controlling transport in organic sandwich devices using fringe fields from ferromagnetic films
Spintronics VI, Vol.8813, pp.88130O-88130O-10
Proceedings of SPIE
01/01/2013
DOI: 10.1117/12.2024602
Abstract
Random, spatially uncorrelated nuclear-hyperfine fields in organic materials dramatically affect electronic transport properties such as electrical conductivity, photoconductivity, and electroluminescence. Competition between spin-dynamics due to these spatially uncorrelated fields and an applied magnetic field leads to large magnetoresistance, even at room temperature where the thermodynamic influences of the resulting nuclear and electronic Zeeman splittings are negligible. Here, we discuss a new method of controlling the electrical conductivity of an organic film at room temperature, using the spatially varying magnetic fringe fields of a magnetically unsaturated ferromagnet. Fringe-field magnetoresistance has a magnitude of several percent, and is hysteretic and anisotropic. This new method of control is sensitive to even remanent magnetic states, leading to different conductivity values in the absence of an applied field. The fringe field effects are insensitive to the ferromagnetic film's thickness (and therefore the fringe field magnitude) but sensitive to the magnetic domain's correlation length. This points at fringe-field gradients as an important ingredient of this mechanism. We develop a model based on fringe-field induced polaron-pair spin-dynamics that successfully describes several key features of the experimental fringe-field magnetoresistance.
Details
- Title: Subtitle
- A new twist on organic spintronics; controlling transport in organic sandwich devices using fringe fields from ferromagnetic films
- Creators
- Markus Wohlgenannt - University of IowaMichael E. Flatte - University of IowaNicholas J. Harmon - University of IowaFujian Wang - University of IowaAndrew D. Kent - New York UniversityFerran Macia - New York UniversityPeter Fischer - Lawrence Berkeley National LaboratoryMi-Young Im - Lawrence Berkeley National Laboratory
- Contributors
- H J Drouhin (Editor)J E Wegrowe (Editor)M Razeghi (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- Spintronics VI, Vol.8813, pp.88130O-88130O-10
- Publisher
- Spie-Int Soc Optical Engineering
- Series
- Proceedings of SPIE
- DOI
- 10.1117/12.2024602
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Number of pages
- 10
- Language
- English
- Date published
- 01/01/2013
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984428787402771
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