Klemm, Philippe and Bange, Sebastian and Poellmann, Agnes and Boehme, Christoph and Lupton, John M. (2017) Nanotesla magnetoresistance in pi-conjugated polymer devices. PHYSICAL REVIEW B, 95 (24): 241407. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We demonstrate submicrotesla sensitivity of organic magnetoresistance in thin-film diodes made of the conducting polymer poly(styrene sulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS). The magnetoresistance sensitivity is shown to be better than 20 parts per billion (ppb). As for other conjugated polymers, magnetoresistance can be separated into two regimes of field strength: the nonmonotonic ultrasmall magnetic field effect on magnetic field scales below 2 mT, and the monotonic intermediate magnetic field effect on scales over several tens of mT. The former gives the PEDOT:PSS magnetoresistance curve a characteristic W-shaped functionality, with inverted turning points compared to those found in conventional organic light-emitting diode (OLED) devices. We succeed in resolving the ultrasmall magnetic field effect of the PEDOT: PSS layer incorporated within an OLED structure, which is responsible for an additional magnetoresistive feature on the ppm scale. Such a device shows unprecedented complexity in magnetoresistance with a total of four extrema within a field range of +/- 1 mT. We propose that these unique characteristics arise from spin-spin interactions in the weakly bound carrier pairs responsible for the spin-dependent recombination probed in magnetoresistance.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ORGANIC SEMICONDUCTORS; MAGNETIC COMPASS; MODEL; MAGNETORECEPTION; HYPERFINE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 27 Feb 2019 11:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/681 |
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