论文标题
超薄范德华磁铁中的室内过气铁磁
Above-room-temperature ferromagnetism in ultrathin van der Waals magnet
论文作者
论文摘要
二维（2D）磁性范德华材料提供了一个强大的平台，用于研究低维磁性，工程新型磁性阶段的基本物理，并启用超薄且高度可调的复原设备。为了实现此类应用的高质量和实用设备，对于可通过剥落而产生的稳健2D磁铁至关重要。在这里，据报道，据报道，据报道，据报道，据报道，据报道，据报道，据报道，钴取代的Fe5gete2（CFGT）的去角质薄片在室温之上表现出磁性。通过钻石中的氮气接种中心通过量子磁成像，在CFGT薄片中观察到室温下的铁磁剂，稀薄至16 nm。这对应于从健壮的单晶中剥落的最薄的室温2D磁铁薄片之一，达到与实用的自旋应用相关的厚度。 CFGT的Curie温度TC的范围从最薄的薄片中的310 K到散装中的328 K。为了研究高温单层铁磁性的前景，进行了蒙特卡洛计算，该计算预测CFGT单层中TC〜270 K的高值。讨论了进一步增强单层TC的途径。这些结果支持CFGT作为实现高质量室温2D磁铁设备的有前途的平台。
Two-dimensional (2D) magnetic van der Waals materials provide a powerful platform for studying fundamental physics of low-dimensional magnetism, engineering novel magnetic phases, and enabling ultrathin and highly tunable spintronic devices. To realize high quality and practical devices for such applications, there is a critical need for robust 2D magnets with ordering temperatures above room temperature that can be created via exfoliation. Here the study of exfoliated flakes of cobalt substituted Fe5GeTe2 (CFGT) exhibiting magnetism above room temperature is reported. Via quantum magnetic imaging with nitrogen-vacancy centers in diamond, ferromagnetism at room temperature was observed in CFGT flakes as thin as 16 nm. This corresponds to one of the thinnest room-temperature 2D magnet flakes exfoliated from robust single crystals, reaching a thickness relevant to practical spintronic applications. The Curie temperature Tc of CFGT ranges from 310 K in the thinnest flake studied to 328 K in the bulk. To investigate the prospect of high-temperature monolayer ferromagnetism, Monte Carlo calculations were performed which predicted a high value of Tc ~270 K in CFGT monolayers. Pathways towards further enhancing monolayer Tc are discussed. These results support CFGT as a promising platform to realize high-quality room-temperature 2D magnet devices.
