Related Experiment Video
Updated: Jun 23, 2025
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Efficient Orbitronic Terahertz Emission Based on CoPt Alloy
Yongshan Liu1,2,3, Yong Xu1,2, Albert Fert4
1National Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 19, 2024
Summary
Researchers developed a more efficient way to generate orbital currents using Cobalt-Platinum (CoPt) alloys, leading to stronger terahertz emission. This breakthrough enhances the potential for developing advanced orbital terahertz emitters.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optoelectronics
Background:
- Orbitronic devices utilize orbitally polarized currents for operation.
- Current methods excite orbital currents with lasers, but terahertz emission efficiency is limited in materials like Nickel (Ni).
Purpose of the Study:
- To investigate efficient light-induced orbital current generation in Cobalt-Platinum (CoPt) alloys.
- To enhance terahertz (THz) emission from orbitronic devices.
Main Methods:
- Fabrication of CoPt/Cu/MgO heterostructures with varying compositions and layer thicknesses.
- Excitation of orbital currents using femtosecond laser pulses.
- Characterization of terahertz emission properties.
Main Results:
- CoPt alloys demonstrate more efficient light-induced orbital current generation compared to Ni.
- Terahertz emission from CoPt/Cu/MgO devices is comparable to benchmark spintronic terahertz emitters.
- Orbital current generation within CoPt, propagation through Cu, and conversion at the Cu/MgO interface were confirmed.
Conclusions:
- CoPt alloys are promising materials for efficient orbital current generation.
- The findings pave the way for developing highly efficient orbital terahertz emitters.
- The study elucidates the mechanism of THz emission originating from orbital dynamics.
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