Electric field tuning of magnetic states in single magnetic molecules
| Autor: | Lu, Yan, Wang, Yunlong, Zhu, Linghan, Yang, Li, Wang, Li |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Review B 106, 064405 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.106.064405 |
| Popis: | Single magnetic molecules may be the smallest functional magnets. An electric-field controllable spin state of magnetic molecules is of fundamental importance for applications while its realization remains challenging. To date the observed spin-electric interaction based on spin-orbit coupling or spin dipole coupling is useful to tune fine spin structures but too weak to flip the spin state. In this work, we propose a new mechanism to realize enhanced spin-electric coupling and flip the spin states by tuning the spin superexchange between local spins. Using first-principles calculations and Heisenberg Hamiltonian, we demonstrate this effect in a family of magnetic molecules, transition metallic Porphyrins. We show that their d-{\pi} and {\pi}-{\pi} spin superexchange couplings are determined by the relative energies of d and {\pi} electronic states, which are sensitive to the applied electric field. Therefore, applying electric field can tune a wide range of magnetic ground states, including ferromagnetic, ferrimagnetic, and antiferromagnetic configurations. This spin-electric coupling may provide a new approach for designing and controlling molecular spintronics. Comment: 21 pages, 7 figures |
| Databáze: | arXiv |
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