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超薄Fe/L1-FePt/Pt异质结构的结构、磁性和太赫兹发射特性

Structural, Magnetic and THz Emission Properties of Ultrathin Fe/L1-FePt/Pt Heterostructures.

作者信息

Locovei Claudiu, Torosyan Garik, Papaioannou Evangelos Th, Crisan Alina D, Beigang Rene, Crisan Ovidiu

机构信息

National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania.

Department of Electrical and Computer Engineering and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany.

出版信息

Nanomaterials (Basel). 2025 Jul 16;15(14):1099. doi: 10.3390/nano15141099.

DOI:10.3390/nano15141099
PMID:40711218
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12298006/
Abstract

Recent achievements in ultrafast spin physics have enabled the use of heterostructures composed of ferromagnetic (FM)/non-magnetic (NM) thin layers for terahertz (THz) generation. The mechanism of THz emission from FM/NM multilayers has been typically ascribed to the inverse spin Hall effect (ISHE). In this work, we probe the mechanism of the ISHE by inserting a second ferromagnetic layer in the form of an alloy between the FM/NM system. In particular, by utilizing the co-sputtering technique, we fabricate Fe/L1-FePt/Pt ultra-thin heterostructures. We successfully grow the tetragonal phase of FePt (L1-phase) as revealed by X-ray diffraction and reflection techniques. We show the strong magnetic coupling between Fe and L1-FePt using magneto-optical and Superconducting Quantum Interference Device (SQUID) magnetometry. Subsequently, by utilizing THz time domain spectroscopy technique, we record the THz emission and thus we the reveal the efficiency of spin-to-charge conversion in Fe/L1-FePt/Pt. We establish that Fe/L1-FePt/Pt configuration is significantly superior to the Fe/Pt bilayer structure, regarding THz emission amplitude. The unique trilayer structure opens new perspectives in terms of material choices for the future spintronic THz sources.

摘要

超快自旋物理学的最新进展使得由铁磁（FM）/非磁性（NM）薄层组成的异质结构可用于太赫兹（THz）产生。FM/NM多层膜的太赫兹发射机制通常归因于逆自旋霍尔效应（ISHE）。在这项工作中，我们通过在FM/NM系统之间插入合金形式的第二铁磁层来探究ISHE的机制。特别是，通过利用共溅射技术，我们制备了Fe/L1-FePt/Pt超薄异质结构。通过X射线衍射和反射技术揭示，我们成功生长出四方相的FePt（L1相）。利用磁光和超导量子干涉器件（SQUID）磁力测量法，我们展示了Fe与L1-FePt之间的强磁耦合。随后，通过利用太赫兹时域光谱技术，我们记录了太赫兹发射，从而揭示了Fe/L1-FePt/Pt中自旋到电荷转换的效率。我们确定，就太赫兹发射幅度而言，Fe/L1-FePt/Pt结构明显优于Fe/Pt双层结构。这种独特的三层结构为未来自旋电子太赫兹源的材料选择开辟了新的前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/16a8f5cd5ae6/nanomaterials-15-01099-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/f82194a1a0db/nanomaterials-15-01099-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/8d713db7f014/nanomaterials-15-01099-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/2efe2da7041f/nanomaterials-15-01099-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/63aa1c2a65cd/nanomaterials-15-01099-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/a10fc670911d/nanomaterials-15-01099-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/06aa8f8fee53/nanomaterials-15-01099-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/29bd6416aa09/nanomaterials-15-01099-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/7c07d0d85e3c/nanomaterials-15-01099-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/16a8f5cd5ae6/nanomaterials-15-01099-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/f82194a1a0db/nanomaterials-15-01099-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/8d713db7f014/nanomaterials-15-01099-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/2efe2da7041f/nanomaterials-15-01099-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/63aa1c2a65cd/nanomaterials-15-01099-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/a10fc670911d/nanomaterials-15-01099-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/06aa8f8fee53/nanomaterials-15-01099-g006a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/29bd6416aa09/nanomaterials-15-01099-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/7c07d0d85e3c/nanomaterials-15-01099-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/add2/12298006/16a8f5cd5ae6/nanomaterials-15-01099-g009.jpg

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本文引用的文献

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