Pressure-Enhanced Ferromagnetism in Layered CrSiTe3 Flakes.
Pressure-Enhanced Ferromagnetism in Layered CrSiTe3 Flakes.
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DOI：
10.1021/acs.nanolett.1c01994
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发表时间：
2021-05
期刊：
影响因子：
10.8
通讯作者：
Cheng Zhang;Yue Gu;Le Wang;Lianglong Huang;Ying Fu;Cai Liu;Shanmin Wang;H. Su;J. Mei;Xiaolong Zou;J. Dai
中科院分区：
文献类型：
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作者：
Cheng Zhang;Yue Gu;Le Wang;Lianglong Huang;Ying Fu;Cai Liu;Shanmin Wang;H. Su;J. Mei;Xiaolong Zou;J. Dai
尽管层状铁磁体最近取得了进展，但这些材料中的铁磁相互作用相当弱。在这里，我们报告了高压磁圆二色性测量显示的层状CrSiTe3片的压力增强铁磁性。在~ 3gpa以下，CrSiTe3在~ 32k下经历顺磁到铁磁的相变，并且铁磁相中的场诱导自旋翻转产生几乎为零的磁滞回线，显示出软铁磁性。在~ 4 GPa以上，发生软到硬的铁磁转变，由具有有限矫顽力和剩余磁化强度的矩形磁滞回线发出信号。有趣的是，随着压力的增加，居里温度和矫顽力在7.8 GPa下分别急剧增加到~ 138 K和0.17 T，而在4.6 GPa下为~ 36 K和0.02 T。这表明压力对交换相互作用有显著的影响，这与DFT计算一致。磁耦合与外部压力之间的有效相互作用为追求高温层状铁磁体提供了新的机会。
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 ∼3 GPa, CrSiTe3 undergoes a paramagnetic-to-ferromagnetic phase transition at ∼32 K, and the field-induced spin-flip in the ferromagnetic phase produces nearly zero hysteresis loops, demonstrating soft ferromagnetism. Above ∼4 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 ∼138 K and 0.17 T at 7.8 GPa, respectively, in contrast to ∼36 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.