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Controlling the magnetic exchange coupling in hybrid heterojunctions via spacer layers of π-conjugated molecules

Controlling the magnetic exchange coupling in hybrid heterojunctions via spacer layers of π-conjugated molecules

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ARNOUX, Quentin, Camille BLOUZON, Dongzhe LI, Yannick J. DAPPE, Alexander SMOGUNOV, Pierre BONVILLE, Ludovic TORTECH, Jean-Baptiste MOUSSY, 2019. Controlling the magnetic exchange coupling in hybrid heterojunctions via spacer layers of π-conjugated molecules. In: Physical Review B. 99(14), 144405. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.99.144405

@article{Arnoux2019-04-04Contr-45788, title={Controlling the magnetic exchange coupling in hybrid heterojunctions via spacer layers of π-conjugated molecules}, year={2019}, doi={10.1103/PhysRevB.99.144405}, number={14}, volume={99}, issn={2469-9950}, journal={Physical Review B}, author={Arnoux, Quentin and Blouzon, Camille and Li, Dongzhe and Dappe, Yannick J. and Smogunov, Alexander and Bonville, Pierre and Tortech, Ludovic and Moussy, Jean-Baptiste}, note={Article Number: 144405} }

Moussy, Jean-Baptiste Bonville, Pierre Arnoux, Quentin Dappe, Yannick J. 2019-05-09T06:39:02Z Smogunov, Alexander Moussy, Jean-Baptiste Mastering and understanding the magnetic couplings between magnetic electrodes separated by organic layers are crucial for developing new hybrid spintronic devices. We study the magnetic exchange interactions in organic-inorganic heterojunctions and unveil the possibility of controlling the strength of the magnetic exchange coupling between two ferromagnetic electrodes across π-conjugated molecules’ (α-sexithiophene or para-sexiphenyl) ultrathin film. In Fe<sub>3</sub>O<sub>4</sub>/π-conjugated molecules/Co magnetic tunnel junctions, an antiferromagnetic interlayer exchange coupling with variable strength is observed according to the nature of the aromatic rings (thiophene or phenyl groups). The underlying physical mechanism is revealed by ab initio calculations relating the strength of magnetic coupling to the spin moment penetration into a molecular layer at the molecule/Co interface. The prospect that magnetic coupling between two ferromagnetic electrodes can be mediated and tuned by organic molecules opens different perspectives in the way magnetization of organic tunnel junctions or spin valves can be driven. Smogunov, Alexander Tortech, Ludovic 2019-05-09T06:39:02Z Li, Dongzhe Bonville, Pierre Tortech, Ludovic Controlling the magnetic exchange coupling in hybrid heterojunctions via spacer layers of π-conjugated molecules 2019-04-04 Li, Dongzhe Dappe, Yannick J. eng Blouzon, Camille Arnoux, Quentin Blouzon, Camille

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