AI Article Synopsis
- The study uses a combination of infrared, terahertz, and Raman spectroscopies along with DFT calculations to analyze the magnetic and structural properties of a material referred to as VI, particularly focusing on changes around 79 K.
- A significant structural transition occurs at 79 K, revealing strong ferromagnetic fluctuations below this temperature and suggesting the potential for long-range ferromagnetic order influenced by magnetoelastic coupling.
- Below 50 K, new Raman modes appear, indicating a close relationship between structural changes and magnetic transitions, and the discovery of a THz magnon in the spectra highlights the potential of VI in the field of ultrafast THz spintronics, traditionally dominated by antiferromagnet materials.
Article Abstract
We use the synergy of infrared, terahertz, and Raman spectroscopies with DFT calculations to shed light on the magnetic and lattice properties of VI. The structural transition at = 79 K is accompanied by a large splitting of polar phonon modes. Below , strong ferromagnetic fluctuations are observed. The variations of phonon frequencies at 55 K induced by magnetoelastic coupling enhanced by spin-orbit interaction indicate the proximity of long-range ferromagnetic order. Below = 50 K, two Raman modes simultaneously appear and show dramatic softening in the narrow interval around the temperature of the second structural transition associated with the order-order magnetic phase transition. Below , a magnon in the THz range appears in Raman spectra. The THz magnon observed in VI indicates the application potential of 2D van der Waals ferromagnets in ultrafast THz spintronics, which has previously been considered the exclusive domain of antiferromagnets.
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| http://dx.doi.org/10.1021/acs.jpclett.2c02944 | DOI Listing |
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