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Pressure-Enhanced Ferromagnetism in Layered CrSiTe3 Flakes
- Source :
- Nano Letters. 21:7946-7952
- Publication Year :
- 2021
- Publisher :
- American Chemical Society (ACS), 2021.
-
Abstract
- The research on van der Waals (vdW) layered ferromagnets have promoted the development of nanoscale spintronics and applications. However, low-temperature ferromagnetic properties of these materials greatly hinder their applications. Here, we report pressure-enhanced ferromagnetic behaviours in layered CrSiTe3 flakes revealed by high-pressure magnetic circular dichroism (MCD) measurement. At ambient pressure, CrSiTe3 undergoes a paramagnetic-to-ferromagnetic phase transition at 32.8 K, with a negligible hysteresis loop, indicating a soft ferromagnetic behaviour. Under 4.6 GPa pressure, the soft ferromagnet changes into hard one, signalled by a rectangular hysteretic loop with remnant magnetization at zero field. Interestingly, with further increasing pressure, the coercive field (H_c) dramatically increases from 0.02 T at 4.6 GPa to 0.17 T at 7.8 GPa, and the Curie temperature (T_c^h: the temperature for closing the hysteresis loop) also increases from ~36 K at 4.6 GPa to ~138 K at 7.8 GPa. The influences of pressure on exchange interactions are further investigated by density functional theory calculations, which reveal that the in-plane nearest-neighbor exchange interaction and magneto-crystalline anisotropy increase simultaneously as pressure increases, leading to increased H_c and T_c^h in experiments. The effective interaction between magnetic couplings and external pressure offers new opportunities for both searching room-temperature layered ferromagnets and designing pressure-sensitive magnetic functional devices.
- Subjects :
- Condensed Matter - Materials Science
Phase transition
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Mechanical Engineering
Exchange interaction
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Bioengineering
General Chemistry
Coercivity
Condensed Matter Physics
Condensed Matter::Materials Science
Magnetization
Hysteresis
Ferromagnetism
Remanence
Condensed Matter::Superconductivity
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Curie temperature
Condensed Matter::Strongly Correlated Electrons
General Materials Science
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi.dedup.....e23670727a20c99692c9f15deb49c81c