范德瓦尔斯力
铁磁性
凝聚态物理
磁铁
兴奋剂
材料科学
相图
大气温度范围
镍
相(物质)
物理
热力学
冶金
量子力学
分子
作者
Xiang Chen,Yu‐Tsun Shao,Rui Chen,Sandhya Susarla,Tom Hogan,Yan‐Ping He,Hongrui Zhang,Siqi Wang,Jie Yao,Peter Ercius,David A. Muller,R. Ramesh,R. J. Birgeneau
标识
DOI:10.1103/physrevlett.128.217203
摘要
The existence of long-range magnetic order in low-dimensional magnetic systems, such as the quasi-two-dimensional van der Waals (vdW) magnets, has attracted intensive studies of new physical phenomena. The vdW Fe_{N}GeTe_{2} (N=3, 4, 5; FGT) family is exceptional, owing to its vast tunability of magnetic properties. In particular, a ferromagnetic ordering temperature (T_{C}) above room temperature at N=5 (F5GT) is observed. Here, our study shows that, by nickel (Ni) substitution of iron in F5GT, a record high T_{C}=478(6) K is achieved. Importantly, pervasive, beyond room-temperature ferromagnetism exists in almost the entire doping range of the phase diagram of Ni-F5GT. We argue that this striking observation in Ni-F5GT can be possibly due to several contributing factors, including increased 3D magnetic couplings due to the structural alterations.
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