Multimodal correlative study of Hall transport and magnetic phases in Fe/Gd multilayer systems

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2025-04-07 DOI:10.1063/5.0239472

Ahmad Us Saleheen, Arnab Singh, David Raftrey, Mike A. Brozius, Margaret R. McCarter, Zoey Tumbleson, Mi-Young Im, Sergio A. Montoya, Eric E. Fullerton, Peter Fischer, Stephen D. Kevan, Sujoy Roy, Sophie A. Morley

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Abstract

The Fe/Gd multilayer system hosts a number of magnetic phases, such as stripe, mixed stripe and skyrmion, skyrmion lattice, and isolated skyrmions for a wide range of temperature and magnetic field. We report different Hall transport signals in a Fe/Gd system through multimodal correlative resonant soft x-ray scattering (RSXS), Hall effect, magneto-optic Kerr effect, and transmission x-ray microscopy measurements. The simultaneous nature of the RSXS and Hall transport measurements allowed us to accurately connect various features in the transport data with the specific magnetic phases. We found that the topological Hall effect (THE) shows peaks with opposite signs, which we attribute to two different mechanisms. Our multimodal correlative study indicates that the sign reversal in THE occurs when the system transforms to and from a skyrmion lattice and low density isolated skyrmion phases. We propose that the skyrmion lattice contributes to the THE through a Berry phase induced emergent magnetic field mechanism in one case, and a skew scattering mechanism corresponding to the isolated low density skyrmion state.

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Fe/Gd多层体系中霍尔输运与磁相的多模态相关研究

在较宽的温度和磁场范围内，Fe/Gd多层体系具有多种磁相，如条纹相、混合条纹相和skyrmion相、skyrmion晶格相和孤立skyrmion相。我们通过多模态相关共振软x射线散射（RSXS）、霍尔效应、磁光Kerr效应和透射x射线显微镜测量报告了Fe/Gd系统中不同的霍尔输运信号。RSXS和霍尔输运测量的同时性使我们能够准确地将输运数据中的各种特征与特定的磁相联系起来。我们发现拓扑霍尔效应（the）的峰值具有相反的符号，我们将其归因于两种不同的机制。我们的多模态相关研究表明，当系统从一个斯基子晶格和低密度孤立斯基子相转换和转换时，在the中发生符号反转。我们提出，在一种情况下，skyrmion晶格通过Berry相诱导的紧急磁场机制和与孤立的低密度skyrmion状态相对应的斜散射机制对the起作用。

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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.