Ferromagnetism regulated by edged cutting and optical identification in monolayer PtSe₂ nanoribbons

Abstract

Regulation of ferromagnetism and electronic structure in PtSe2 nanostructures has attracted much attention because of its potential in spintronics. The magnetic and optical properties of PtSe2 nanoribbons with different edge reconstruction and external deformations are calculated by density function theory. In 1 T phase PtSe2 nanoribbons, the ferromagnetism induced by spin polarization of exposed Pt or Se atoms is decreased with the reducing nanoribbon width. For smaller nanoribbon, the magnetism can be regulated by external strain more easily. However, the magnetism cannot occur in 1 H phase PtSe2 nanoribbon. The absorption spectra are suggested to identify the nanoribbon structural changes in detail. Our results suggest the use of edge reconstruction and strain engineering in spintronics applications.