| AVS 64th International Symposium & Exhibition | |
| Magnetic Interfaces and Nanostructures Division | Wednesday Sessions |
| Session MI+SA-WeM |
| Session: | Controlling Magnetism in Oxides and Multiferroics and Chirality in Spin Transport and Magnetism (cont.) |
| Presenter: | John Abendroth, University of California at Los Angeles |
| Authors: | J. Abendroth, University of California at Los Angeles N. Nakatsuka, University of California at Los Angeles M. Ye, University of California at Los Angeles D. Stemer, University of California at Los Angeles D. Kim, University of California at San Diego E. Fullerton, University of California at San Diego A. Andrews, University of California at Los Angeles P. Weiss, University of California at Los Angeles |
| Correspondent: | Click to Email |
Understanding spin-selective interactions between electrons and chiral molecules is critical to elucidating the prospective significance of electron spin in biological processes. We report the visualization of spin‑dependent charge transport in microscale‑patterned, self‑assembled monolayers of double‑stranded DNA on ferromagnetic substrates using fluorescence microscopy. Patterned DNA arrays provide background regions in every measurement to quantify the substrate magnetization-dependent fluorescence due to the chiral‑induced spin selectivity effect. Fluorescence quenching of photoexcited dye molecules bound within DNA duplexes is dependent upon the rate of charge separation/recombination upon photoexcitation and efficiency of DNA‑mediated charge transfer to the surface. Here, the latter process is modulated with an external magnetic field to switch the magnetization orientation of the underlying ferromagnetic substrates. Using this experimental technique, we are investigating molecular parameters that can be manipulated to influence the magnitude of the spin selectivity effect in DNA arrays to assess candidly the potential of chiral assemblies for organic spintronics. In particular, we are monitoring the influence of heavy metal species that are incorporated predictably within DNA duplexes to change the strength of molecular spin-orbit coupling as a result of the heavy atom effect.