December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
EL03.20.03

Optical and Magnetic Properties of Fe-Infused 2D-MoS2

When and Where

Dec 6, 2024
4:00pm - 4:15pm
Hynes, Level 3, Room 302

Presenter(s)

Co-Author(s)

Yujia Wang1,Nurul Azam1,Jeff Rable1,Syed Shahed1,Zachariah Hennighausen2,Jing Kong2,John Ferrier1,Matthew Matzelle1,Bernardo Barbiellini3,1,Barun Ghosh1,Arun Bansil1,Swastik Kar1

Northeastern University1,Massachusetts Institute of Technology2,LUT University3

Abstract

Yujia Wang1,Nurul Azam1,Jeff Rable1,Syed Shahed1,Zachariah Hennighausen2,Jing Kong2,John Ferrier1,Matthew Matzelle1,Bernardo Barbiellini3,1,Barun Ghosh1,Arun Bansil1,Swastik Kar1

Northeastern University1,Massachusetts Institute of Technology2,LUT University3
Doping of two-dimensional (2D) transition metal dichalcogenides (TMDs) with magnetic impurities has generated significant interest for their potential applications as room temperature dilute magnetic semiconductors. In particular, iron-doped 2D-MoS<sub>2</sub> is interesting, as it has been reported to demonstrate diamagnetic, ferromagnetic, and paramagnetic behaviors. A key focus has been to understand whether their observed properties originate purely from the infused Fe atoms, or from defect/defect complexes in these systems. We present our results from simultaneous investigations of the structural, optical, and magnetic properties of mono- and multilayer 2D-Fe@MoS<sub>2</sub>. Samples were synthesized by a chemical vapor deposition (CVD) system that allows controlled introduction of Fe atoms into the 2D structure of MoS<sub>2</sub>. Aberration corrected high resolution scanning transmission electron microscopy (STEM), high-angle annular dark-field imaging (HAADF), and atomic force microscopy (AFM) were used to characterize the structure of these 2D materials from atoms-scale to nano- and micro-scales. Confocal Raman and photoluminescence (PL) mapping were employed to investigate the impact of Fe-infusion on the in-plane and out-of-plane vibrational modes, and the dynamics of the A-exciton and A-trion populations and their binding energies. Magnetic properties of these materials were investigated using magnetic force microscopy (MFM) and scanning nitrogen-vacancy center microscopy (SNVM). These experimental results suggest that while Fe infusion in our system led to sizable modification in the Raman and PL behavior, and MFM measurements appear to show phase-sensitive responses, no clear indication of ferromagnetic ordering could be found. We will discuss the nature of magnetism in Fe-doped MoS<sub>2</sub> based on our experimental observations and parallel theoretical modeling.

Keywords

2D materials | quantum materials | Raman spectroscopy

Symposium Organizers

Deji Akinwande, The University of Texas at Austin
Cinzia Casiraghi, University of Manchester
Carlo Grazianetti, CNR-IMM
Li Tao, Southeast University

Session Chairs

Roshni Babu
Carlo Grazianetti

In this Session