| Zdroj: |
Rogers, M, Habib, A, Teobaldi, G, Moorsom, T, Johansson, J O, Hedley, L, Keatley, P S, Hicken, R J, Valvidares, M, Gargiani, P, Alosaimi, N, Poli, E, Ali, M, Burnell, G, Hickey, B J & Cespedes, O 2023, ' A Hybrid Magneto-Optic Capacitive Memory with Picosecond Writing Time ', Advanced Functional Materials . < https://onlinelibrary.wiley.com/doi/10.1002/adfm.202212173 > |
| Popis: |
The long-term future of information storage requires the use of sustainable nanomaterials in architectures operating at high frequencies. Interfaces can play a key role in this pursuit via emergent functionalities that break out from conventional operation methods. Here, spin-filtering effects and photocurrents are combined at metal-molecular-oxide junctions in a hybrid magneto-capacitive memory. Light exposure of metal-fullerene-metal oxide devices results in spin-polarized charge trapping and the formation of a magnetic interface. Because the magnetism is generated by a photocurrent, the writing time is determined by exciton formation and splitting, electron hopping, and spin-dependent trapping. Transient absorption spectroscopy measurements show changes in the electronic states as a function of the magnetic history of the device within picoseconds of the optical pumping. The stored information is read using time-resolved scanning magneto optic Kerr effect measurements during microwave irradiation. The emergence of a magnetic interface in the picosecond timescale opens new paths of research to design hybrid magneto-optic structures operating at high frequencies for sensing, computing, and information storage. |
