通过磁场调制可调谐钴铁氧体的太赫兹响应

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-07-21 DOI:10.1063/5.0273900

Zhen Zhou, Lvkang Shen, Xiaohua Xing, Keyu Tan, Die Zou, Qiankun Zhang, Rui Zhu, Zhiyong Wang, Jianquan Yao, Ming Liu, Jianing Chen, Liang Wu

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引用次数: 0

摘要

尽管太赫兹（THz）产生和探测技术取得了重大进展，但便携式太赫兹系统的实际部署仍然受到现有调制器限制的制约，特别是严格的温度要求、低效的热管理和高功耗。在这里，我们展示了利用CoFe2O4/MgO/F-Mica复合结构在磁控太赫兹调制方面的突破。利用太赫兹时域谱技术系统地研究了复合材料在不同磁场下的可调谐光响应和介电性能。实验结果表明，太赫兹传输衰减与磁场有关，传输谱与外加磁场强度成正比。提出了考虑外磁场变化的理论模型，该模型与虚分量的实验结果吻合较好。值得注意的是，该复合材料在磁场作用下同时实现了相位调制。这种特殊的磁响应性显着拓宽了铁氧体在太赫兹波段的应用潜力。这些发现为在6G通信、医疗诊断和无损检测应用中设计可调谐多功能太赫兹磁器件提供了重要见解。

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Tunable THz response in cobalt ferrite via magnetic field modulation

Despite significant advancements in terahertz (THz) generation and detection technologies, the practical deployment of portable THz systems remains constrained by existing modulator limitations, particularly stringent temperature requirements, inefficient thermal management, and high power consumption. Here, we demonstrate a breakthrough in magnetically controlled THz modulation using a CoFe2O4/MgO/F-Mica composite structure. The tunable optical response and dielectric properties of the composite under varying magnetic fields were systematically investigated via THz time-domain spectroscopy. Experimental results revealed a magnetic field-dependent THz transmission attenuation, with systematic suppression of transmission spectra proportional to the applied magnetic field intensity. A theoretical model accounting for external magnetic field variations was proposed, which agrees well with the experimental results regarding the imaginary component. Remarkably, the composite material realizes phase modulation simultaneously under magnetic field. This exceptional magnetic responsiveness significantly broadens the application potential of ferrites in the THz regime. These findings provide critical insights for designing tunable multifunctional THz magnetic devices in 6G communications, medical diagnostics, and nondestructive testing applications.

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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.