Apparent Ferromagnetism in Exfoliated Ultrathin Pyrite Sheets
| Autor: | Lucas M. Sassi, Anand B. Puthirath, Nithya Chakingal, Pulickel M. Ajayan, Robert Vajtai, Gelu Costin, Guanhui Gao, Douglas S. Galvao, Eliezer Fernando Oliveira, Aravind Puthirath Balan, Francisco C. Robles Hernandez, Rahul R. Nair, Vishnu Sreepal, Prasankumar Thibeorchews |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Physics - Applied Physics Applied Physics (physics.app-ph) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint Surface energy 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Ferromagnetism Monolayer Diamagnetism Density functional theory Physical and Theoretical Chemistry 0210 nano-technology Ground state Nanosheet |
| Zdroj: | The Journal of Physical Chemistry C. 125:18927-18935 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.1c04977 |
| Popis: | Experimental evidence for ferromagnetic ordering in isotropic atomically thin two-dimensional crystals has been missing until a bilayer Cr2Ge2Te6, and a three-atom thick monolayer CrI3 are shown to retain ferromagnetic ordering at finite temperatures. Here, we demonstrate successful isolation of a non-van der Waals type ultra-thin nanosheet of FeS2 derived from naturally occurring pyrite mineral (FeS2) by means of liquid-phase exfoliation. Structural characterizations imply that (111) oriented sheets are predominant and is supported theoretically by means of density functional theory surface energy calculations. Spin-polarized density theory calculations further predicted that (111) oriented three-atom thick pyrite sheet has a stable ferromagnetic ground state different from its diamagnetic bulk counterpart. This theoretical finding is evaluated experimentally employing low temperature superconducting quantum interference device measurements and observed an anomalous ferromagnetic kind of behavior. 21 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|