CPOS Seminar: Open-Shell Derivatives for Solid-State Spintronic Applications

Speaker: Hyunki Yeo, Postdoctoral Researcher, UC Santa Barbara, Material Research Laboratory - Chabinyc Group

Radical polymers represent an exciting frontier in solid-state conducting materials, distinguished by their unique charge transport mechanisms and optical properties due to singly occupied molecular orbital energy levels. Their paramagnetic, open-shell structures enable interactions with magnetic fields and facilitate promising spin transport capabilities, positioning them as potential candidates for next-generation quantum information systems.

An overview of recent advances in conductive polymers within solid-state devices is provided, focusing particularly on their roles in optoelectronic and spintronic applications. By synthesizing and studying the charge transport mechanisms of 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) derivatives, including dendrimers and liquid crystals, the discussion delves into the resulting remarkable electromagnetic responses in solid-state devices. Further exploration covers the synthesis of stereoregular polymers designed for advanced applications, such as giant magnetoresistance (GMR) and the inverse spin Hall effect (ISHE) in spintronic materials. By employing stereoselective cationic polymerization, a polymer with stable persistent radicals in each repeat unit is engineered, achieving the long-range order essential for effective spin transport. This breakthrough challenges conventional doping requirements in organic spin-pumping devices, achieving high conductivity, extensive spin-diffusion lengths, and enhanced processability.

In conclusion, the imperative to extend research on open-shell macromolecules is underscored, aiming to provide foundational insights that drive innovation in this field. This approach aspires to unlock the full potential of radical polymers, yielding both pioneering scientific advancements and significant societal impact.