Electrical Generation and Detection of Terahertz Signal Based on Spin-Wave Emission From Ferrimagnets
March 16, 2020
Publication
- Electrical Generation and Detection of Terahertz Signal Based on Spin-Wave Emission From Ferrimagnets
- March 16, 2020
Terahertz (THz) signals, mainly generated by photonic or electronic approaches, are being sought for
various applications, whereas the development of magnetic source might be a necessary step to harness
the magnetic nature of electromagnetic radiation. We show that the relativistic effect on the current driven
domain-wall motion induces THz spin-wave emission in ferrimagnets. The required current density
increases dramatically in materials with strong exchange interaction and rapidly exceeds 1012Am−2, leading
to the device breakdown and thus the lack of experimental evidence. By translating the collective
magnetization oscillations into voltage signals, we propose a three-terminal device for the electrical detection
of THz spin wave. Through material engineering, a wide frequency range from 264 GHz to 1.1 THz
and uniform continuous signals with improved output power can be obtained. As a reverse effect, the spin
wave generated in this system is able to move the ferrimagnetic domain wall. Our work provides guidelines
for the experimental verification of THz spin wave, and could stimulate the design of THz spintronic
oscillators for wideband applications as well as the all-magnon spintronic devices.
Researcher/Author: Zhifeng Zhu, Kaiming Cai, Jiefang Deng, Venkata Pavan Kumar Miriyala, Hyunsoo Yang, Xuanyao Fong, Gengchiau Liang
PHYSICAL REVIEW APPLIED 13, 034040 (2020); https://doi.org/10.1103/PhysRevApplied.13.034040
Researcher/Author: Zhifeng Zhu, Kaiming Cai, Jiefang Deng, Venkata Pavan Kumar Miriyala, Hyunsoo Yang, Xuanyao Fong, Gengchiau Liang
PHYSICAL REVIEW APPLIED 13, 034040 (2020); https://doi.org/10.1103/PhysRevApplied.13.034040