Abstract
We report magnetoresistance (MR) measurements for structures with micrometer-thick regioregular, polythiophene (rr-P3HT) polymer layers between two ferromagnetic contacts. Hole spin transport through the polymer layer leads to a relative MR value in 300 mT fields of 0.3% at 300 K and increasing to 18% at 25 K. The inferred intrinsic spin lifetime and diffusion length are about 7 ms and 0.4 μm, respectively. The spin transport coherence length is enhanced by the electric field, leading to an enhancement in MR with increasing applied voltage.
Original language | English (US) |
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Article number | 232507 |
Journal | Applied Physics Letters |
Volume | 95 |
Issue number | 23 |
DOIs | |
State | Published - 2009 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)