Polaron spin current transport in organic semiconductors

Shun Watanabe; K. Ando; Keehoon Kang; Sebastian Mooser; Yana Vaynzof; Hidekazu Kurebayashi; Eiji Saitoh; Henning Sirringhaus

doi:10.1038/nphys2901

Polaron spin current transport in organic semiconductors

Shun Watanabe, K. Ando, Keehoon Kang, Sebastian Mooser, Yana Vaynzof, Hidekazu Kurebayashi, Eiji Saitoh, Henning Sirringhaus

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

172 Citations (Scopus)

Abstract

In spintronics, pure spin currents play a key role in transmitting, processing and storing information. A pure spin current is a flow of electron spin angular momentum without a simultaneous flow of charge current. It can be carried by conduction electrons or magnons and has been studied in many inorganic metals, semiconductors and insulators, but not yet in organic semiconductors. Charge carriers in €-conjugated organic materials are localized spin-1/2 polarons which move by hopping, but the mechanisms of their spin transport and relaxation are not well understood. Here we use ferromagnetic resonance spin pumping in a ferromagnet/conjugated polymer/nonmagnetic spin-sink trilayer to demonstrate the ability of polarons to carry pure spin currents over hundreds of nanometres with long spin relaxation times of up to a millisecond and to exhibit Hanle precession. By systematically comparing charge and spin transport on the same trilayer we show that spin-orbit coupling mediates spin relaxation at room temperature.

Original language	English
Pages (from-to)	308-313
Number of pages	6
Journal	Nature Physics
Volume	10
Issue number	4
DOIs	https://doi.org/10.1038/nphys2901
Publication status	Published - 2014 Apr

Bibliographical note

Funding Information:
This work was supported by the Cabinet Office, Government of Japan through its ‘Funding Program for Next Generation World-Leading Researchers’, PRESTO-JST ‘Innovative nano-electronics through interdisciplinary collaboration among material, device and system layers’, the Asahi Glass Foundation and the Engineering and Physical Sciences Research Council (EPSRC). The authors thank M. Heeney of Imperial College for supplying the PBTTT, J. Sinova of the University of Mainz for stimulating discussions, Y. Kajiwara for helping with low-temperature measurements, D. Hirobe for helping with spin pumping measurements, D. Venkateshvaran for helping with conductivity measurements, and O. Pachoumi for helping with SEM measurements. K.K. thanks the Samsung Scholarship Foundation for financial support.

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1038/nphys2901

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title = "Polaron spin current transport in organic semiconductors",

abstract = "In spintronics, pure spin currents play a key role in transmitting, processing and storing information. A pure spin current is a flow of electron spin angular momentum without a simultaneous flow of charge current. It can be carried by conduction electrons or magnons and has been studied in many inorganic metals, semiconductors and insulators, but not yet in organic semiconductors. Charge carriers in €-conjugated organic materials are localized spin-1/2 polarons which move by hopping, but the mechanisms of their spin transport and relaxation are not well understood. Here we use ferromagnetic resonance spin pumping in a ferromagnet/conjugated polymer/nonmagnetic spin-sink trilayer to demonstrate the ability of polarons to carry pure spin currents over hundreds of nanometres with long spin relaxation times of up to a millisecond and to exhibit Hanle precession. By systematically comparing charge and spin transport on the same trilayer we show that spin-orbit coupling mediates spin relaxation at room temperature.",

author = "Shun Watanabe and K. Ando and Keehoon Kang and Sebastian Mooser and Yana Vaynzof and Hidekazu Kurebayashi and Eiji Saitoh and Henning Sirringhaus",

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AU - Kurebayashi, Hidekazu

AU - Saitoh, Eiji

AU - Sirringhaus, Henning

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Polaron spin current transport in organic semiconductors

Abstract

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