Time-resolved magneto-optical effects in the altermagnet candidate MnTe

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-11-20 DOI:10.1063/5.0244878

Isaiah Gray, Qinwen Deng, Qi Tian, Michael Chilcote, J. Steven Dodge, Matthew Brahlek, Liang Wu

引用次数: 0

Abstract

α -MnTe is an antiferromagnetic semiconductor with above room temperature TN = 310 K, which is promising for spintronic applications. Recently, it was reported to be an altermagnet, containing bands with momentum-dependent spin splitting; time-resolved experimental probes of MnTe are, therefore, important both for understanding novel magnetic properties and potential device applications. We investigate ultrafast spin dynamics in epitaxial MnTe(001)/InP(111) thin films using pump-probe magneto-optical measurements in the Kerr configuration. At room temperature, we observe an oscillation mode at 55 GHz that does not appear at zero magnetic field. Combining field and polarization dependence, we identify this mode as a magnon, likely originating from inverse stimulated Raman scattering. Magnetic field-dependent oscillations persist up to at least 335 K, which could reflect coupling to known short-range magnetic order in MnTe above TN. Additionally, we observe two optical phonons at 3.6 and 4.2 THz, which broaden and redshift with increasing temperature.

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变磁体候选 MnTe 中的时间分辨磁光效应

α -MnTe是一种反铁磁性半导体，高于室温TN = 310 K，具有自旋电子应用前景。最近，有报道称锰碲是一种变磁体，含有随动量变化的自旋分裂带；因此，锰碲的时间分辨实验探测对于了解新型磁性能和潜在的器件应用都非常重要。我们在克尔构型中使用泵浦探针磁光测量法研究了外延锰钛（001）/InP（111）薄膜中的超快自旋动力学。在室温下，我们观察到一个频率为 55 GHz 的振荡模式，该模式在零磁场下不会出现。结合磁场和偏振依赖性，我们确定这种模式是一种磁子，可能源自反向受激拉曼散射。与磁场相关的振荡至少持续到 335 K，这可能反映了 TN 以上锰碲中已知的短程磁序耦合。此外，我们还在 3.6 和 4.2 THz 处观察到两个光学声子，它们随着温度的升高而变宽和重移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.