论文标题
基于从铁磁体发射的旋转波发射的Terahertz信号的发电和检测
Electrical generation and detection of terahertz signal based on spin-wave emission from ferrimagnets
论文作者
论文摘要
Terahertz（THZ）信号主要由光子或电子方法产生，正在为各种应用寻求，而磁源的发展可能是利用电磁辐射的磁性的必要步骤。我们表明，对电流驱动的域壁运动的相对论效应诱导了铁磁体中的THZ自旋波发射。所需的电流密度在具有较强交换相互作用的材料中急剧增加，并且迅速超过1012 A M-2，从而导致设备崩溃，因此缺乏实验证据。通过将集体磁化振荡转化为电压信号，我们提出了一个三端装置，用于电气检测THZ自旋波。通过材料工程，可以获得从264 GHz到1.1 THz的宽频率范围，并且可以获得具有提高输出功率的均匀连续信号。作为反向效果，该系统中产生的自旋波能够移动铁磁域壁。我们的工作为THZ自旋波的实验验证提供了指南，并可以刺激用于宽带应用以及全麦克农旋转器设备的THZ Spintronic振荡器的设计。
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 1012 A m-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, 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 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.
