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 | |
| Publication status | Published - 2014 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Polaron spin current transport in organic semiconductors. / Watanabe, Shun; Ando, Kazuya; Kang, Keehoon; Mooser, Sebastian; Vaynzof, Yana; Kurebayashi, Hidekazu; Saitoh, Eiji; Sirringhaus, Henning.
In: Nature Physics, Vol. 10, No. 4, 2014, p. 308-313.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Polaron spin current transport in organic semiconductors
AU - Watanabe, Shun
AU - Ando, Kazuya
AU - Kang, Keehoon
AU - Mooser, Sebastian
AU - Vaynzof, Yana
AU - Kurebayashi, Hidekazu
AU - Saitoh, Eiji
AU - Sirringhaus, Henning
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
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U2 - 10.1038/nphys2901
DO - 10.1038/nphys2901
M3 - Article
VL - 10
SP - 308
EP - 313
JO - Nature Physics
JF - Nature Physics
SN - 1745-2473
IS - 4
ER -