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Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

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Quasi-Two-Dimensional Magnon Identification in Antiferromagnetic FePS₃via Magneto-Raman Spectroscopy.

Amber McCreary¹, Jeffrey R Simpson^1,2, Thuc T Mai^1,3

¹Nanoscale Device Characterization Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Physical Review. B

|April 15, 2024

Summary

Researchers identified a magnon in iron thiophosphate (FePS₃) using magneto-Raman spectroscopy. This magnetic excitation, previously mistaken for a phonon, exhibits temperature and field-dependent behavior crucial for understanding 2D magnetism.

Keywords:

2D materials FePS3 Ising antiferromagnet Magnon Mott insulator Raman spectroscopy magneto-Raman phonon spin-wave

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Published on: June 7, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Magnetism

Background:

Van der Waals-bonded magnetic materials exhibit long-range magnetic ordering down to the single-layer limit.
Iron thiophosphate (FePS₃) is a large spin (S=2) Mott insulator with a honeycomb Fe lattice, known as a quasi-two-dimensional Ising antiferromagnet.

Purpose of the Study:

To investigate the nature of Raman-active modes in FePS₃ below its Néel temperature.
To characterize magnetic excitations and their behavior under external stimuli.

Main Methods:

Magneto-Raman spectroscopy was employed as an optical probe.
Polarization-dependent Raman spectroscopy was utilized to study symmetry behavior.

Main Results:

A Raman-active mode at ≈3.7 THz (122 cm^-1) was identified as a magnon, not a phonon.
The magnon exhibited characteristic frequency shifts with temperature and splitting with magnetic field, yielding a g-factor of ≈2.
Symmetry analysis confirmed the magnon's behavior within the magnetic point group of FePS₃.

Conclusions:

The study provides definitive identification of a magnon in FePS₃, correcting previous interpretations.
This finding enhances the understanding of magnetic excitations in 2D van der Waals materials.
The results open avenues for exploring fundamental physics and applications of layered magnets.