Magnetic and spin-based technologies for data storage and processing pose unique challenges for information transduction to light because of magnetic metals optical loss, and the inefficiency and resistivity of semiconductor spin-based emitters at room temperature. Transduction between magnetic and optical information in typical organic semiconductors poses additional challenges as the Faraday and Kerr magnetooptical effects rely on the electronic spin-orbit interaction, and the spin-orbit interaction in organics is weak. Other methods of coupling light and spin have emerged in organics, however, as the spin-dependent character of exciton recombination, with spin injection from magnetic electrodes, provides magnetization-sensitive light emission, although such approaches have been limited to low temperature and low polarization efficiency. Here we demonstrate room temperature information transduction between a magnet and an organic light emitting diode that does not require electrical current, based on control via the magnets remanent field of the exciton recombination process in the organic semiconductor.
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