Scale-Enhanced Magnetism in Exfoliated Atomically Thin Magnetite Sheets.

Autor: Puthirath AB; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Shirodkar SN; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Gao G; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Hernandez FCR; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.; Mechanical Engineering Technology, University of Houston, Houston, TX, 77204, USA., Deng L; Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX, 77204, USA., Dahal R; Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX, 77204, USA., Apte A; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Costin G; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, 77005, USA., Chakingal N; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Balan AP; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Sassi LM; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Tiwary CS; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Vajtai R; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Chu CW; Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX, 77204, USA.; Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Yakobson BI; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA., Ajayan PM; Department of Materials Science and NanoEngineering, Rice University, Houston, TX, 77005, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2020 Nov; Vol. 16 (45), pp. e2004208. Date of Electronic Publication: 2020 Oct 20.
DOI: 10.1002/smll.202004208
Abstrakt: The discovery of ferromagnetism in atomically thin layers at room temperature widens the prospects of 2D materials for device applications. Recently, two independent experiments demonstrated magnetic ordering in two dissimilar 2D systems, CrI 3 and Cr 2 Ge 2 Te 6 , at low temperatures and in VSe 2 at room temperature, but observation of intrinsic room-temperature magnetism in 2D materials is still a challenge. Here a transition at room temperature that increases the magnetization in magnetite while thinning down the bulk material to a few atom-thick sheets is reported. DC magnetization measurements prove ferrimagnetic ordering with increased magnetization and density functional theory calculations ascribe their origin to the low dimensionality of the magnetite layers. In addition, surface energy calculations for different cleavage planes in passivated magnetite crystal agree with the experimental observations of obtaining 2D sheets from non-van der Waals crystals.
(© 2020 Wiley-VCH GmbH.)
Databáze: MEDLINE
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