| AVS 64th International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures Division | Monday Sessions |
| Session MI+BI+EM+SA-MoA |
| Session: | Role of Chirality in Spin Transport and Magnetism |
| Presenter: | Greg Szulczewski, The University of Alabama |
| Authors: | G.J. Szulczewski, The University of Alabama T. Sutch, The University of Alabama M. Lockart, The University of Alabama H. Chen, The University of Alabama P. Rupar, The University of Alabama M. Bowman, The University of Alabama |
| Correspondent: | Click to Email |
We report results from an electron spin resonance (ESR) study to probe the spin-dynamics in the conducting polymer poly {[ N, N9 -bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5 9 -(2,2 9 -bithiophene)} or P(NDI2OD-T2). Chemical reduction of the polymer was achieved by using cobaltacene, which introduces unpaired electrons into the polymer. Continuous wave ESR measurements were done on frozen solutions and thin films over the temperature range of 77 to 300 K. Narrow ESR peaks with broad tails were observed, suggesting strong one-dimensional anisotropic conduction. Electron nuclear double resonance spectroscopy was used to analyze the hyperfine coupling of the frozen solutions. The results indicate a proton hyperfine coupling of 1.5 MHz, which suggests the spins are delocalized over several monomer units. Electron spin echo envelope modulation spectroscopy was measured from 6 to 90 K to investigate the spatial distribution of nuclear spins in the environment of the unpaired electrons spins. The measurements show that spin relaxation increases rapidly when the temperature in increases from 6 to 90 K. A kinetic model that accounts for the spin-dynamics will be presented.