Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/22946
Title: 
Authors: 
Subjects: 
Photo-thermal spin switching
Terahertz phase reversal
Terahertz hysteresis
Reconfigurable terahertz emission
Issue Date: 
2021
Citation: 
Agarwal, P., Medwal, R., Kumar, A., Asada, H., Fukuma, Y., Rawat, R. S.,Battiato, M. & Singh, R. (2021). Ultrafast photo-thermal switching of terahertz spin currents. Advanced Functional Materials, 31(17), Article 2010453. https://doi.org/10.1002/adfm.202010453
Abstract: 
Dissipationless and scattering-free spin-based terahertz electronics is the futuristic technology for energy efficient information processing. Femtosecond light pulse provides an ideal pathway for exciting the ferromagnet (FM) out-of-equilibrium, causing ultrafast demagnetization and superdiffusive spin transport at sub-picosecond timescale, giving rise to transient terahertz radiation. Concomitantly, light pulses also deposit thermal energy at short timescales, suggesting the possibility of abrupt change in magnetic anisotropy of the FM that could cause ultrafast photo-thermal switching (PTS) of terahertz spin currents. Here, a single light pulse induced PTS of the terahertz spin current manifested through the phase reversal of the emitted terahertz photons is demonstrated. The switching of the transient spin current is due to the reversal of the magnetization state across the energy barrier of the FM layer. This demonstration opens a new paradigm for on-chip spintronic devices enabling ultralow-power hybrid electronics and photonics fueled by the interplay of charge, spin, thermal, and optical signals.
Description: 
This is the final draft, after peer-review, of a manuscript published in Advanced functional materials. The published version is available online at https://doi.org/10.1002/adfm.202010453
URI: 
ISSN: 
1616-3028 (online)
DOI: 
Grant ID: 
MOE Academic Research Fund (Grant no.: MOE2017-T2-1-110)
MOE Academic Research Fund (Grant no.: MOE2016-T3-1-006(S))
Grant no.: NRF-CRP21-2018-003
Funding Agency: 
Ministry of Education, Singapore
National Research Foundation, Singapore
File Permission: 
Open
File Availability: 
With file
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