Enhanced Spin-Orbit Coupling in Heavy Metals via Molecular Coupling

Alotibi, Satam, Hickey, Bryan J, Teobaldi, Gilberto ORCID: 0000-0001-6068-6786, Ali, Mannan, Barker, Joseph, Poli, Emiliano, O'Regan, David D, Ramasse, Quentin, Burnell, Gavin, Patchett, James
et al (show 4 more authors) (2021) Enhanced Spin-Orbit Coupling in Heavy Metals via Molecular Coupling. ACS APPLIED MATERIALS & INTERFACES, 13 (4). pp. 5228-5234.

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5d metals are used in electronics because of their high spin-orbit coupling (SOC) leading to efficient spin-electric conversion. When C<sub>60</sub> is grown on a metal, the electronic structure is altered due to hybridization and charge transfer. In this work, we measure the spin Hall magnetoresistance for Pt/C<sub>60</sub> and Ta/C<sub>60</sub>, finding that they are up to a factor of 6 higher than those for pristine metals, indicating a 20-60% increase in the spin Hall angle. At low fields of 1-30 mT, the presence of C<sub>60</sub> increased the anisotropic magnetoresistance by up to 700%. Our measurements are supported by noncollinear density functional theory calculations, which predict a significant SOC enhancement by C<sub>60</sub> that penetrates through the Pt layer, concomitant with trends in the magnetic moment of transport electrons acquired via SOC and symmetry breaking. The charge transfer and hybridization between the metal and C<sub>60</sub> can be controlled by gating, so our results indicate the possibility of dynamically modifying the SOC of thin metals using molecular layers. This could be exploited in spin-transfer torque memories and pure spin current circuits.

Item Type: Article
Additional Information: 15 pages, 4 figures
Uncontrolled Keywords: metallo-molecular interfaces, spin-orbit interaction, yttrium iron garnet, emergent functionalities, spin hall angle, molecular spintronics, charge transfer
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 10 May 2021 09:44
Last Modified: 18 Jan 2023 22:49
DOI: 10.1021/acsami.0c19403
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3121783