journal article·2023-07-03

Extreme Air Sensitivity and Nonself-Limited Oxidation of Two-Dimensional Magnetic Tellurides

Amanda L. Coughlin, Jun-Jie Zhang, Sammy Bourji, Bingqiang Wei, Gaihua Ye, Zhipeng Ye, Jeonghoon Hong, Tongxie Zhang, Magda Andrade, Xun Zhan, Rui He, Jian Wang, Boris Yakobson, Yaroslav Losovyj, Ching-Wu Chu, Liangzi Deng, Shixiong Zhang

ACS Materials Letters· Volume 5· Issue 7
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Abstract

The two-dimensional (2D) self-intercalated van der Waals magnets, chromium tellurides (Cr 1+δ Te 2 ), with room temperature ferromagnetism and exotic topological spin textures, have emerged as an attractive platform for the development of ultrathin spintronic devices. While many prior studies claim Cr 1+δ Te 2 are air-stable, which is crucial for practical applications, we demonstrate that within only minutes of exposure to air dramatic changes occur in the Raman and X-ray photoelectron spectroscopy spectra of nanoplates at room temperature. Time-dependent magnetization measurements and transmission electron microscopy studies suggested the rapid oxidation is not self-limited and has distinct processes on the surfaces and edges. Density functional theory calculations confirmed the spontaneous oxygen adsorption on the surface and the thermodynamically favorable oxidation process. These findings demonstrate unambiguously that the surface of Cr 1+δ Te 2 is extremely air-sensitive, highlighting the necessity of surface protection for fundamental studies of intrinsic 2D magnetism and practical applications of advanced spintronic devices.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Topological Materials and Phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Indiana University, Bloomington, Indiana 47405, United States

Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States

Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, United States

Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, Nebraska 68588, United States

Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, United States

Electron Microscopy Center, Indiana University, Bloomington, Indiana 47405, United States

Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States

Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, United States

Quantum Science and Engineering Center, Indiana University, Bloomington, Indiana 47405, United States

Funding

Indiana University · T.L.L Temple Foundation · Air Force Office of Scientific Research · Division of Electrical, Communications and Cyber Systems · John J. and Rebecca Moores Endowment · Texas Center for Superconductivity, University of Houston · Division of Materials Research

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