Electrical Control of Ultrafast Magnetic Speeds in Graphene Spin Field-Effect Junctions
We demonstrate ultrafast graphene spin-field-effect junctions, where gate-tunable superdiffusive spin currents across graphene-ferromagnet interfaces enable electric field control of magnetization dynamics in the ferromagnet. By electrostatically tuning the Fermi level in graphene underlying a cobalt thin film, we modulate the ultrafast spin transport across graphene-cobalt interfaces, reducing femtosecond laser-induced demagnetization time from 203 fs in bare cobalt thin films to 93 fs, a more than 100% increase in the rate of magnetization quenching. Supported by superdiffusive spin transport calculations, our findings unlock field-tunable magnetic speeds in devices, paving the way for innovations in subpicosecond spintronic memory-logic operations. Furthermore, this work creates new possibilities for electrical modulation of spin dynamics and ultrafast spin injection into two-dimensional quantum materials, with potential for next-generation quantum sensors and faster magnetic technologies.
Authors
- Olof Karis (ORCID: https://orcid.org/0000-0001-6406-217X)
- Anjan Barman (ORCID: https://orcid.org/0000-0002-4106-5658)
- Francesco Foggetti (ORCID: https://orcid.org/0000-0003-0205-6123)
- Suchetana Mukhopadhyay (ORCID: https://orcid.org/0000-0003-4464-6084)
- M. Venkata Kamalakar (ORCID: https://orcid.org/0000-0003-2385-9267)
- Peter M. Oppeneer (ORCID: https://orcid.org/0000-0002-9069-2631)
- David Muradas-Belinchón (ORCID: https://orcid.org/0000-0002-6838-1941)
- Surya N. Panda (ORCID: https://orcid.org/0000-0002-7924-3827)
Institutions
- Uppsala University (SE)
- Indian Institute of Science Education and Research Kolkata (IN)
- Bose (United States) (US)
- S.N. Bose National Centre for Basic Sciences (IN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-08-28
- DOI
- https://doi.org/10.1103/7ldk-csp9
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Department of Science and Technology, Ministry of Science and Technology, India
- National Science Council
- Knut och Alice Wallenbergs Stiftelse
- Stiftelsen Olle Engkvist Byggmästare
- Vetenskapsrådet
- European Research Council
- S. N. Bose National Centre for Basic Sciences