Reversible magnetic switching of high-spin molecules on a giant Rashba surface

Abstract

The quantum mechanical screening of a spin via conduction electrons depends sensitively on the environment seen by the magnetic impurity. A high degree of responsiveness can be obtained with metal complexes, as the embedding of a metal ion into an organic molecule prevents intercalation or alloying and allows for a good control by an appropriate choice of the ligands. There are therefore hopes to reach an "on demand" control of the spin state of single molecules adsorbed on substrates. Hitherto one route was to rely on "switchable" molecules with intrinsic bistabilities triggered by external stimuli, such as temperature or light, or on the controlled dosing of chemicals to form reversible bonds. However, these methods constrain the functionality to switchable molecules or depend on access to atoms or molecules. Here, we present a way to induce bistability also in a planar molecule by making use of the environment. We found that the particular "habitat" offered by an antiphase boundary of the Rashba system BiAg${}_2$ stabilizes a second structure for manganese phthalocyanine molecules, in which the central Mn ion moves out of the molecular plane. This corresponds to the formation of a large magnetic moment and a concomitant change of the ground state with respect to the conventional adsorption site. The reversible spin switch found here shows how we can not only rearrange electronic levels or lift orbital degeneracies via the substrate, but even sway the effects of many-body interactions in single molecules by acting on their surrounding.

arXiv commentMain text, 7 pages, 6 figures. Supplementary material available at https://www.nature.com/articles/s41535-018-0126-z

References in corpus (12)

• Continuous-time Monte Carlo methods for quantum impurity models
• A continuous-time solver for quantum impurity models
• Giant Spin-splitting in the Bi/Ag(111) Surface Alloy
• Continuous Time Quantum Monte Carlo method for fermions
• Electric field driven switching of individual magnetic skyrmions
• Plane-wave based electronic structure calculations for correlated materials using dynamical mean-field theory and projected local orbitals
• Reversible Single Spin Control of Individual Magnetic Molecule by Hydrogen Atom Adsorption
• Local magnetic moments in iron and nickel at ambient and Earth's core conditions
• First-Matsubara-frequency rule in a Fermi liquid. Part I: Fermionic self-energy
• General DFT++ method implemented with projector augmented waves: Electronic structure of SrVO${}_3$ and the Mott Transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Kondo effect and spin quenching in high-spin molecules on metal substrates
• Fermi-liquid behavior and thermal conductivity of ε-iron at Earth's core conditions

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