论文标题
薄fe $ _3 $ gete $ _2 $薄片，依赖压力依赖的中间磁相
Pressure-dependent Intermediate Magnetic Phase in Thin Fe$_3$GeTe$_2$ Flakes
论文作者
论文摘要
我们研究了使用原位磁循环二科主义（MCD）光谱法在不同的压力和温度下进行分层的Fe $ _3 $ gete $ _2 $薄片中铁磁性的演变。我们发现，在平面外磁场下，滞后循环的矩形形状可以维持7 GPA以下。在该压力之上，中间状态出现在低温区域，由8形偏斜滞后环信号。同时，随着压力的增加，强制场和居里温度降低，这意味着交换相互作用的减少和压力下的磁结晶各向异性。中间阶段具有迷路域结构，这归因于基于Jagla的理论的交换相互作用与磁晶体各向异性的比率增加。此外，我们的计算结果揭示了6 GPA附近的结构过渡弱，从而导致Fe离子的磁动量下降。
We investigated the evolution of ferromagnetism in layered Fe$_3$GeTe$_2$ flakes under different pressures and temperatures using in situ magnetic circular dichroism (MCD) spectroscopy. We found that the rectangle shape of hysteretic loop under an out-of-plane magnetic field sweep can sustain below 7 GPa. Above that pressure, an intermediate state appears at low temperature region signaled by an 8-shaped skew hysteretic loop. Meanwhile, the coercive field and Curie temperature decrease with increasing pressures, implying the decrease of the exchange interaction and the magneto-crystalline anisotropy under pressures. The intermediate phase has a labyrinthine domain structure, which is attributed to the increase of ratio of exchange interaction to magneto-crystalline anisotropy based on Jagla's theory. Moreover, our calculation results reveal a weak structural transition around 6 GPa, which leads to a drop of the magnetic momentum of Fe ions.
