用Pt中感生的反常霍尔效应探测绝缘Cr2Ge2Te6的磁性
Probing Magnetism in Insulating Cr2Ge2Te6 by Induced Anomalous Hall Effect in Pt
摘要：
二维铁磁体Cr2 Ge 2 Te 6（CGT）在居里温度以下电阻很大，因此通过电输运探测其磁性变得非常困难。然而，通过与Pt形成异质结构，我们在沉积在CGT的薄（< 50 nm）剥离薄片上的5 nm厚的Pt中观察到明显的异常霍尔效应（AHE）。AHE磁滞回线持续到~ 60 K，这与从体磁化测量获得的CGT的居里温度很好地匹配。具有狭窄开口的倾斜AHE环指示磁畴形成，这通过低温磁力显微镜（MFM）成像来证实。这些结果清楚地表明，CGT将其磁化印记在Pt层的AHE信号中。密度泛函理论计算的CGT/Pt异质结构表明，感生铁磁性的Pt可能是主要负责所观察到的AHE。我们的研究结果建立了一个强大的方式调查磁性的二维绝缘铁磁体，可以潜在的单层设备。
英文摘要：
Two-dimensional ferromagnet Cr2Ge2Te6 (CGT) is so resistive below its Curie temperature that probing its magnetism by electrical transport becomes extremely difficult. By forming heterostructures with Pt, however, we observe clear anomalous Hall effect (AHE) in 5 nm thick Pt deposited on thin (< 50 nm) exfoliated flakes of CGT. The AHE hysteresis loops persist to ~ 60 K, which matches well to the Curie temperature of CGT obtained from the bulk magnetization measurements. The slanted AHE loops with a narrow opening indicate magnetic domain formation, which is confirmed by low-temperature magnetic force microscopy (MFM) imaging. These results clearly demonstrate that CGT imprints its magnetization in the AHE signal of the Pt layer. Density functional theory calculations of CGT/Pt heterostructures suggest that the induced ferromagnetism in Pt may be primarily responsible for the observed AHE. Our results establish a powerful way of investigating magnetism in 2D insulating ferromagnets which can potentially work for monolayer devices.
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