Ferromagnetism and structural phase transition in monoclinic FeGe film

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-15 DOI:10.1063/5.0250221

Guangdong Nie, Guanghui Han, S. Z. Erfa, Kangxi Liu, Shijian Chen, Hao Ding, Fangdong Tang, Licong Peng, Young Sun, Deshun Hong

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引用次数: 0

Abstract

Binary compound FeGe hosts multiple structures, from cubic and hexagonal to monoclinic. Compared to the well-known skyrmion lattice in the cubic phase and the antiferromagnetic charge–density wave in the hexagonal phase, the monoclinic FeGe is less explored. Here, we synthesized the monoclinic FeGe films on Al2O3 (001) and studied their structural, magnetic, and transport properties. X-ray diffraction and transmission electron microscopy characterizations indicate that the FeGe films are epitaxial to the substrate. Unlike the antiferromagnetic bulk, the monoclinic FeGe films are ferromagnetic with Curie temperature as high as ∼800 K, contributing to the anomalous Hall effect in the transport measurements. Similar to the hexagonal FeGe, we captured a structural phase transition in the monoclinic FeGe films at ∼100 K in real and reciprocal spaces by transmission electron microscope. Our work enriches the phase diagram of the FeGe family and suggests that FeGe offers an ideal platform for studying multiphase transitions and related device applications.

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单斜FeGe薄膜的铁磁性和结构相变

二元化合物铁锗具有多种结构，从立方、六方到单斜。与众所周知的立方相的斯基子晶格和六方相的反铁磁电荷密度波相比，单斜铁锗的探索较少。在此，我们在Al2O3（001）上合成了单斜斜FeGe薄膜，并研究了其结构、磁性和输运性质。x射线衍射和透射电镜表征表明，FeGe薄膜是外延到衬底的。与反铁磁性体不同，单斜FeGe薄膜具有铁磁性，居里温度高达~ 800 K，导致输运测量中的异常霍尔效应。与六方FeGe相似，我们通过透射电子显微镜在实空间和倒易空间中捕捉到单斜FeGe薄膜在~ 100 K下的结构相变。我们的工作丰富了FeGe家族的相图，并表明FeGe为研究多相转变和相关器件应用提供了理想的平台。

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.