Pressure-Enhanced Ferromagnetism in Layered CrSiTe3 Flakes.
Nano Lett
; 21(19): 7946-7952, 2021 Oct 13.
Article
em En
| MEDLINE
| ID: mdl-34533027
ABSTRACT
Despite recent advances in layered ferromagnets, ferromagnetic interactions in these materials are rather weak. Here, we report pressure-enhanced ferromagnetism in layered CrSiTe3 flakes revealed by high-pressure magnetic circular dichroism measurements. Below â¼3 GPa, CrSiTe3 undergoes a paramagnetic-to-ferromagnetic phase transition at â¼32 K, and the field-induced spin-flip in the ferromagnetic phase produces nearly zero hysteresis loops, demonstrating soft ferromagnetism. Above â¼4 GPa, a soft-to-hard ferromagnetic transition occurs, signaled by rectangular-shaped hysteresis loops with finite coercivity and remanent magnetization. Interestingly, as pressure increases, the Curie temperature and coercivity dramatically increase up to â¼138 K and 0.17 T at 7.8 GPa, respectively, in contrast to â¼36 K and 0.02 T at 4.6 GPa. It indicates a remarkable influence of pressure on exchange interactions, which is consistent with DFT calculations. The effective interaction between magnetic couplings and external pressure offers new opportunities in pursuit of high-temperature layered ferromagnets.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
China