Kavli Affiliate: David A. Muller
| First 5 Authors: Xiang Chen, Yu-Tsun Shao, Rui Chen, Sandhya Susarla, Tom Hogan
| Summary:
The existence of long range magnetic order in low dimensional magnetic
systems, such as the quasi-two-dimensional (2D) 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. Particularly, a ferromagnetic ordering
temperature ($T_{text{C}}$) above room temperature at $N$ = 5 (F5GT) is
observed. Here, our study shows that, by nickel (Ni) substitution of iron (Fe)
in F5GT, a record high $T_{text{C}}$ = 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, in
which the structural alteration enhanced 3D magnetic couplings might be
critical for enhancing the ferromagnetic order.
| Search Query: ArXiv Query: search_query=au:”David A. Muller”&id_list=&start=0&max_results=10