Scale-Enhanced Magnetism in Exfoliated Atomically Thin Magnetite Sheets
| Autor: | Gelu Costin, Anand B. Puthirath, Nithya Chakingal, Rabin Dahal, Guanhui Gao, Aravind Puthirath Balan, Lucas M. Sassi, Ching-Wu Chu, Liangzi Deng, Francisco C. Robles Hernandez, Boris I. Yakobson, Amey Apte, Sharmila N. Shirodkar, Robert Vajtai, Pulickel M. Ajayan, Chandra Sekhar Tiwary |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Thin layers Condensed matter physics Magnetism Cleavage (crystal) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Biomaterials Crystal Condensed Matter::Materials Science Magnetization chemistry.chemical_compound Ferromagnetism chemistry Ferrimagnetism General Materials Science 0210 nano-technology Biotechnology Magnetite |
| Zdroj: | Small (Weinheim an der Bergstrasse, Germany). 16(45) |
| ISSN: | 1613-6829 |
| Popis: | 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, CrI3 and Cr2 Ge2 Te6 , at low temperatures and in VSe2 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. |
| Databáze: | OpenAIRE |
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