Above-room-temperature intrinsic ferromagnetism in ultrathin van der Waals crystal Fe$_{3+x}$GaTe$_2$

Gaojie Zhang, Jie Yu, Hao Wu, Li Yang, Wen Jin, Bichen Xiao, Wenfeng Zhang, Haixin Chang
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Abstract

Two-dimensional (2D) van der Waals (vdW) magnets are crucial for ultra-compact spintronics. However, so far, no vdW crystal has exhibited tunable above-room-temperature intrinsic ferromagnetism in the 2D ultrathin regime. Here, we report the tunable above-room-temperature intrinsic ferromagnetism in ultrathin vdW crystal Fe$_{3+x}$GaTe$_2$ ($x$ = 0 and 0.3). By increasing the Fe content, the Curie temperature (TC) and room-temperature saturation magnetization of bulk Fe$_{3+x}$GaTe$_2$ crystals are enhanced from 354 to 376 K and 43.9 to 50.4 emu/g, respectively. Remarkably, the robust anomalous Hall effect in 3-nm Fe$_{3.3}$GaTe$_2$ indicate a record-high TC of 340 K and a large room-temperature perpendicular magnetic anisotropy energy of 6.6 * 10^5 J/m$^3$, superior to other ultrathin vdW ferromagnets. First-principles calculations reveal the asymmetric density of states and an additional large spin exchange interaction in ultrathin Fe$_{3+x}$GaTe$_2$ responsible for robust intrinsic ferromagnetism and higher Tc. This work opens a window for above-room-temperature ultrathin 2D magnets in vdW-integrated spintronics.
超薄范德华晶体 Fe$_{3+x}$GaTe$_2$ 中的室温以上本征铁磁性
二维(2D)范德华(vdW)磁体对于超小型自旋电子学至关重要。然而,迄今为止,还没有一种范德华晶体在二维超薄状态下表现出室温以上可调谐的本征铁磁性。在这里,我们报告了超薄 vdW 晶体 Fe$_{3+x}$GaTe$_2$ ($x$ = 0 和 0.3)中的可调室温以上本征铁磁性。值得注意的是,3 纳米 Fe$_{3.3}$GaTe$_2$ 中的强反常霍尔效应显示出创纪录的 340 K 高 TC 和 6.6 * 10^5 J/m$^3$ 的大室温垂直磁各向异性能,优于其他超薄 vdW 铁磁体。第一原理计算揭示了超薄 Fe$_{3+x}$GaTe$_2$ 中的非对称态密度和额外的大自旋交换相互作用,它们是产生强大的本征铁磁性和较高 Tc 的原因。这项工作为 vdW 集成自旋电子学中的室温以上超薄二维磁体打开了一扇窗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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