论文标题
掺杂的范德华磁铁中的室温超越室温超越室温的铁磁性：ni掺杂fe $ _5 $ gete $ _2 $ with $ t _ {\ text {c}} $最高478 k
Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe$_5$GeTe$_2$ with $T_{\text{C}}$ up to 478 K
论文作者
论文摘要
在低维磁系统中的远程磁顺序的存在，例如准二维（2D）范德华（VDW）磁体，吸引了对新物理现象的密集研究。 VDW Fe $ _n $ gete $ _2 $（$ n $ = 3，4，5; fgt）家族非常出色，这是由于其磁性巨大的可调性。特别是，观察到$ n $ = 5（f5gt）以上室温高于室温的铁磁有序温度（$ t _ {\ text {c}} $）。在这里，我们的研究表明，通过镍（Ni）在F5GT中取代铁（Fe），记录了高$ t _ {\ text {c}} $ = 478（6）k。重要的是，在Ni-F5GT的相图几乎整个掺杂范围内都存在普遍的，超过房间的室温铁磁学。我们认为，在Ni-F5GT中的这种惊人的观察可能是由于几个促成因素，其中结构变化增强了3D磁耦合可能对于增强铁磁顺序至关重要。
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.
