Piezoelectric strain control of terahertz spin current

• Main Authors: Chaurasiya, Avinash, Li, Ziqi, Medwal, Rohit, Gupta, Surbhi, Mohan, John Rex, Fukuma, Yasuhiro, Asada, Hironori, Chia, Elbert E. M., Rawat, Rajdeep Singh
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics; Phase Reversal; Piezoelectric Strain
• Online Access: https://hdl.handle.net/10356/164928
• Institution: Nanyang Technological University

Electrical control of photogenerated terahertz (THz) spin current pulses from a spintronic emitter has been at the forefront for the development of scalable, cost-efficient, wideband optospintronic devices. Artificially combined ferroelectric and ferromagnet heterostructure provides the potential avenue to deterministically control the phase of THz spin current pulse through piezoelectric strain. Here, the electric field-mediated piezoelectric strain control of photogenerated THz spin current pulse from a multiferroic spintronic emitter is demonstrated. The phase reversal of the THz spin current pulse is obtained from the combined effect of piezoelectric strain and a small magnetic field applied opposite to the initial magnetization of the ferromagnet. The piezoelectric strain-controlled phase switching of THz spin current thus opens a door to develop efficient strain engineered scalable on-chip THz spintronics devices.