Pervasive beyond Room-Temperature Ferromagnetism in a Doped van der Waals Magnet

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 mag...

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Published in:Physical review letters 2022-05, Vol.128 (21), p.217203-217203, Article 217203
Main Authors: Chen, Xiang, Shao, Yu-Tsun, Chen, Rui, Susarla, Sandhya, Hogan, Tom, He, Yu, Zhang, Hongrui, Wang, Siqi, Yao, Jie, Ercius, Peter, Muller, David A, Ramesh, Ramamoorthy, Birgeneau, Robert J
Format: Article
Language:English
Subjects:
2-dimensional systems
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ferromagnetism
magnetic order
magnetic techniques
magnetism
magnetization measurements
order parameters
phase transitions
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.128.217203