Atomic-Scale Visualization of Multiferroicity in Monolayer NiI 2 .

Autor: Amini M; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland., Fumega AO; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland., González-Herrero H; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland.; Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, E-28049, Spain.; Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, E-28049, Spain., Vaňo V; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland.; Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ, 08544, USA., Kezilebieke S; Department of Physics, Department of Chemistry and Nanoscience Center, University of Jyväskylä, Jyväskylä, FI-40014, Finland., Lado JL; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland., Liljeroth P; Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 May; Vol. 36 (18), pp. e2311342. Date of Electronic Publication: 2024 Feb 05.
DOI: 10.1002/adma.202311342
Abstrakt: Progress in layered van der Waals materials has resulted in the discovery of ferromagnetic and ferroelectric materials down to the monolayer limit. Recently, evidence of the first purely 2D multiferroic material was reported in monolayer NiI 2 . However, probing multiferroicity with scattering-based and optical bulk techniques is challenging on 2D materials, and experiments on the atomic scale are needed to fully characterize the multiferroic order at the monolayer limit. Here, scanning tunneling microscopy (STM) supported by density functional theory (DFT) calculations is used to probe and characterize the multiferroic order in monolayer NiI 2 . It is demonstrated that the type-II multiferroic order displayed by NiI 2 , arising from the combination of a magnetic spin spiral order and a strong spin-orbit coupling, allows probing the multiferroic order in the STM experiments. Moreover, the magnetoelectric coupling of NiI 2 is directly probed by external electric field manipulation of the multiferroic domains. The findings establish a novel point of view to analyze magnetoelectric effects at the microscopic level, paving the way toward engineering new multiferroic orders in van der Waals materials and their heterostructures.
(© 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
Externí odkaz: