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Title: Cr silicate as a prototype for engineering magnetic phases in air-stable two-dimensional transition-metal silicates

Journal Article · · 2D Materials

Abstract Identifying environmentally inert, ferromagnetic two-dimensional (2D) materials with high Curie temperatures ( T c ) 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 2 . 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 2 Si 2 O 9 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 2 Si 2 O 9 H 4 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); US Army Research Office (ARO)
Grant/Contract Number:
SC0012704; AC02-05CH11231; W911NF19-1-0371
OSTI ID:
1997292
Alternate ID(s):
OSTI ID: 1996614
Report Number(s):
BNL-224708-2023-JAAM
Journal Information:
2D Materials, Journal Name: 2D Materials Vol. 10 Journal Issue: 4; ISSN 2053-1583
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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  • Doudin, Nassar; Saritas, Kayahan; Ismail-Beigi, Sohrab
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 39, Issue 6 https://doi.org/10.1116/6.0001397
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