Sign reversal of magnetoresistance and inverse spin Hall effect in doped conducting polymers

Sun, D and Zhai, Y and Van Schooten, KJ and Zhang, C and Kavand, M and Malissa, H and Groesbeck, M and Menon, R and Boehme, C and Vardeny, ZV (2018) Sign reversal of magnetoresistance and inverse spin Hall effect in doped conducting polymers. In: Journal of Physics Condensed Matter, 30 (48).

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Abstract

Conducting polymers, where pristine polymers are doped by active dopants, have been used in a variety of flexible optoelectronic device applications due to their tunable conductivity values. Charge transport in these materials has been intensively studied for over three decades. However, spin transport properties in these compounds have remained elusive. Here, we studied two polaron-dominated and trap-dominated spin transport processes in two types of PEDOT:PSS polymers that are lightly and heavily doped, respectively. Using pulsed spin-pumping and spin-injection techniques, we found the sign of inverse spin Hall effect and magnetoresistance obtained from the lightly doped PEDOT:PSS film can reverse its polarity as a function of temperature and applied bias, in contrast to that in the heavily doped PEDOT:PSS film. Our work provides an alternative approach for studying the spin transport in conducting polymer films.

Item Type:	Journal Article
Publication:	Journal of Physics Condensed Matter
Publisher:	Institute of Physics Publishing
Additional Information:	The copyright for this article belongs to the IOP Publishing Ltd.
Keywords:	Conducting polymers; Conductive films; Crystal symmetry; Magnetoresistance; Optical pumping; Optoelectronic devices; Polymer films, Heavily doped; Lightly doped; Organic spintronics; Pristine polymers; Sign reversal; Spin injection; Spin transport; Tunable conductivity, Spin Hall effect
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Aug 2022 11:53
Last Modified:	02 Aug 2022 11:53
URI:	https://eprints.iisc.ac.in/id/eprint/75155

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