Efficient Terahertz Generation from CoPt-based Terahertz Emitters via Orbital-to-Charge Conversion
arxiv(2024)
摘要
Orbitronics devices operate by manipulating orbitally-polarized currents.
Recent studies have shown that these orbital currents can be excited by
femtosecond laser pulses in ferromagnet as Ni and converted into ultrafast
charge current via orbital-to-charge conversion. However, the terahertz
emission from orbitronic terahertz emitter based on Ni is still much weaker
than the typical spintronic terahertz emitter. Here, we report more efficient
light-induced generation of orbital current from CoPt alloy and the orbitronic
terahertz emission by CoPt/Cu/MgO shows terahertz radiation comparable to that
of efficient spintronic terahertz emitters. By varying the concentration of
CoPt alloy, the thickness of Cu, and the capping layer, we confirm that THz
emission primarily originates from the orbital accumulation generated within
CoPt, propagating through Cu and followed by the subsequent orbital-to-charge
conversion from the inverse orbital Rashba-Edelstein effect at the Cu/MgO
interface. This study provides strong evidence for the very efficient orbital
current generation in CoPt alloy, paving the way to efficient orbital terahertz
emitters.
更多查看译文
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要