arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.07398cond-mat.mtrl-scicond-mat.mes-hallphysics.app-phphysics.optics
收藏

反常霍尔效应产生太赫兹辐射的直接证据

Direct evidence of terahertz emission arising from anomalous Hall effect

V. Mottamchetty, P. Rani, R. Brucas, A. Rydberg, P. Svedlindh, R. Gupta

AI总结:

本文首次提供单层CoFeB铁磁薄膜中反常霍尔效应直接产生太赫兹辐射的实验证据,并通过厚度、取向和泵浦通量优化发射性能,揭示斜散射为主要物理机制。

摘要:

详细理解铁磁(FM)材料中导致太赫兹(THz)辐射的不同机制,将有助于设计高效的太赫兹发射器。在本报告中,我们展示了单层Co$_{0.4}$Fe$_{0.4}$B$_{0.2}$(CoFeB)铁磁薄膜产生太赫兹辐射的直接证据。导致太赫兹辐射的主要机制是反常霍尔效应(AHE),该效应源于铁磁层界面处反射的自旋极化电流在铁磁层内形成的净回流电流。通过改变激光束的厚度、取向和泵浦通量,对基于AHE的CoFeB发射器的太赫兹辐射进行了优化。电输运测量结果表明,载流子的斜散射是CoFeB基于AHE的太赫兹发射器中产生太赫兹辐射的原因。

英文摘要:

A detailed understanding of the different mechanisms being responsible for terahertz (THz) emission in ferromagnetic (FM) materials will aid in designing efficient THz emitters. In this report, we present direct evidence of THz emission from single layer Co$_{0.4}$Fe$_{0.4}$B$_{0.2}$ (CoFeB) FM thin films. The dominant mechanism being responsible for the THz emission is the anomalous Hall effect (AHE), which is an effect of a net backflow current in the FM layer created by the spin-polarized current reflected at the interfaces of the FM layer. The THz emission from the AHE-based CoFeB emitter is optimized by varying its thickness, orientation, and pump fluence of the laser beam. Results from electrical transport measurements show that skew scattering of charge carriers is responsible for the THz emission in the CoFeB AHE-based THz emitter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑