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Probing the Ferromagnetism and Spin Wave Gap in VI3 by Helicity-Resolved Raman Spectroscopy
- Source :
- Nano Letters. 20:6024-6031
- Publication Year :
- 2020
- Publisher :
- American Chemical Society (ACS), 2020.
-
Abstract
- Circularly polarized light carries light spin angular momentum, which may lead helicity-resolved Raman scattering to be sensitive to the electronic spin configuration in magnetic materials. Here, we demonstrate that all Raman modes in the 2D ferromagnet VI3 show different scattering intensities to left and right circularly polarized light at low temperatures, which gives direct evidence of the time-reversal symmetry breaking. By measuring the circular polarization of the dominant Raman mode with respect to the temperature and magnetic field, the ferromagnetic (FM) phase transition and hysteresis behavior can be clearly resolved. Besides the lattice excitations, quasielastic scattering is detected in the paramagnetic phase, and it gradually evolves into the acoustic magnon mode at 18.5 cm-1 in the FM state, which gives the spin wave gap that results from large magnetic anisotropy. Our findings demonstrate that helicity-resolved Raman spectroscopy is an effective tool to directly probe the ferromagnetism in 2D magnets.
- Subjects :
- Quasielastic scattering
Materials science
Condensed matter physics
Scattering
Mechanical Engineering
Magnon
Bioengineering
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
symbols.namesake
Ferromagnetism
Spin wave
symbols
Condensed Matter::Strongly Correlated Electrons
General Materials Science
0210 nano-technology
Raman spectroscopy
Raman scattering
Circular polarization
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi...........8ff9c620a1de2dc60b1a1da63a166902