Exchange-induced spin polarization in a single magnetic molecule junction

Tian Pei, James O. Thomas, Simen Sopp, Ming-Yee Tsang, Nicola Dotti, Jonathan Baugh, Nicholas F. Chilton, Salvador Cardona-Serra, Alejandro Gaita-Ariño, Harry L. Anderson and Lapo Bogani ()
Additional contact information
Tian Pei: University of Oxford
James O. Thomas: University of Oxford
Simen Sopp: University of Oxford
Ming-Yee Tsang: University of Oxford
Nicola Dotti: University of Oxford
Jonathan Baugh: University of Waterloo
Nicholas F. Chilton: University of Manchester
Salvador Cardona-Serra: Universidad de València
Alejandro Gaita-Ariño: Universidad de València
Harry L. Anderson: University of Oxford, Chemistry Research Laboratory
Lapo Bogani: University of Oxford

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Many spintronic devices rely on the presence of spin-polarized currents at zero magnetic field. This is often obtained by spin exchange-bias, where an element with long-range magnetic order creates magnetized states and displaces the hysteresis loop. Here we demonstrate that exchange-split spin states are observable and usable in the smallest conceivable unit: a single magnetic molecule. We use a redox-active porphyrin as a transport channel, coordinating a dysprosium-based single-molecule-magnet inside a graphene nano-gap. Single-molecule transport in magnetic field reveals the existence of exchange-split channels with different spin-polarizations that depend strongly on the field orientation, and comparison with the diamagnetic isostructural compound and milikelvin torque magnetometry unravels the role of the single-molecule anisotropy and the molecular orientation. These results open a path to using spin-exchange in molecular electronics, and offer a method to quantify the internal spin structure of single molecules in multiple oxidation states.

Date: 2022
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DOI: 10.1038/s41467-022-31909-w

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