Significant orbit-to-charge conversion in CoFeB/Pt/SrIrO3 trilayer by terahertz emission spectroscopy

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2025-02-12 DOI:10.1063/5.0225322

Weiwei Li, Yangkai Wang, Hao Cheng, Jun Huang, Bing Xiong, Jianping Huang, Qiuping Huang, Zhangzhang Cui, Zhengping Fu, Yalin Lu

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引用次数: 0

Abstract

Orbitronics has been extensively explored theoretically and experimentally in orbital-charge conversion. The spin-charge conversion efficiency induced by the orbital Hall effect can be much larger than that of the spin Hall effect. However, orbitronics focuses primarily on light metal elements and their oxides, while exploring heavy metal elements and oxides is rare. In this Letter, we report significant enhancements in the ultrafast spin (orbit)-charge conversion for the CoFeB/Pt/SrIrO3 (SIO) trilayer using the terahertz emission spectroscopy, where the maximum enhancement calculated by the normalized terahertz emission amplitude is about three times that for the CoFeB/Pt bilayer. In addition, we observe a ∼2 orders of magnitude enhancement in the THz emission due to significant orbital transport in Pt-insertion heavy metal layer in the CoFeB/Pt/SIO heterostructure as compared to the CoFeB/SIO bilayer. Our findings not only demonstrate that the transition metals and their oxides exhibit strong inverse orbital Hall effect but also show that multilayer structures allow enhancing the spin-to-charge current conversion efficiency for THz applications, providing a direction to tailor THz emitters.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.