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- 2023Cr silicate as a prototype for engineering magnetic phases in air-stable two-dimensional transition-metal silicatescitations
- 2023Aluminum substitution in low damping epitaxial lithium ferrite filmscitations
- 2023Limits to the strain engineering of layered square-planar nickelate thin filmscitations
- 2015User Applications Driven by the Community Contribution Framework MPContribs in the Materials Project
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article
Cr silicate as a prototype for engineering magnetic phases in air-stable two-dimensional transition-metal silicates
Abstract
<jats:title>Abstract</jats:title><jats:p>Identifying environmentally inert, ferromagnetic two-dimensional (2D) materials with high Curie temperatures (<jats:italic>T</jats:italic><jats:sub>c</jats:sub>) down to the single layer limit has been an obstacle to fundamental studies of 2D magnetism and application of 2D heterostructures to spin-polarized devices. To address this challenge, the growth, structure and magnetic properties of a 2D Cr-silicate single layer on Pt(111) was investigated experimentally and theoretically. The layer was grown by sequentially depositing SiO and Cr followed by annealing in O<jats:sub>2</jats:sub>. Scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and low energy electron microscopy all indicated a well-ordered layer that uniformly covered the surface, with STM and LEED indicating that the silicate relaxed to its favored lattice constant. Further experimental characterizations demonstrated that the Cr was nominally 3+ but with a lower electron density than typical trivalent Cr compounds. Comparison with theory identified a Cr<jats:sub>2</jats:sub>Si<jats:sub>2</jats:sub>O<jats:sub>9</jats:sub> structure that resembles a single layer of a dehydrogenated dioctahedral silicate. Magnetic circular dichroism in x-ray absorption spectroscopy revealed a ferromagnetically ordered state up to at least 80 K. Theoretical analysis revealed that the Cr in a dehydrogenated Cr-silicate/Pt(111) is more oxidized than Cr in freestanding Cr<jats:sub>2</jats:sub>Si<jats:sub>2</jats:sub>O<jats:sub>9</jats:sub>H<jats:sub>4</jats:sub> layers. This greater oxidation was found to enhance ferromagnetic coupling and suggests that the magnetism may be tuned by doping. The 2D Cr-silicate is the first member of a broad series of possible layered first-row transition metal silicates with magnetic order; thus, this paper introduces a new platform for investigating 2D ferromagnetism and the development of magnetoelectronic and spintronic devices by stacking 2D atomic layers.</jats:p>