Patterning-Induced Ferromagnetism of Fe3GeTe2 van der Waals Materials beyond Room Temperature
Patterning-Induced Ferromagnetism of Fe3GeTe2 van der Waals Materials beyond Room Temperature
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DOI：
10.1021/acs.nanolett.8b02806
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发表时间：
2018-09-01
期刊：
影响因子：
10.8
通讯作者：
Qiu, Ziqiang
中科院分区：
文献类型：
--
作者：
Li, Qian;Yang, Mengmeng;Qiu, Ziqiang
磁性范德华 (vdW) 材料已成为自旋电子学应用的有希望的候选材料，特别是在最近发现单层 vdW 材料中的本征铁磁性之后。人们迫切需要超出室温的可调谐铁磁 vdW 材料。在这里，我们报告了巡回铁磁体 Fe3GeTe2 的实空间成像研究，及其居里温度远高于环境温度的增强。我们发现 Fe3GeTe2 中的磁性长程有序具有非常规的面外条带域相特征。在由聚焦离子束图案化的 Fe3GeTe2 微结构中，面外条纹域相在 230 K 时经历了令人惊讶的转变，转变为面内涡旋相，该相在室温之外持续存在。 Fe3GeTe2 材料中可调谐铁磁性的发现为在室温自旋电子器件中使用 vdW 磁体开辟了巨大的机会。
Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications, especially after the recent discovery of intrinsic ferromagnetism in monolayer vdW materials. There has been a critical need for tunable ferromagnetic vdW materials beyond room temperature. Here, we report a real-space imaging study of itinerant ferromagnet Fe3GeTe2 and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in Fe3GeTe2 is characterized by an unconventional out-of-plane stripe-domain phase. In Fe3GeTe2 microstructures patterned by a focused ion beam, the out-of-plane stripe domain phase undergoes a surprising transition at 230 K to an in-plane vortex phase that persists beyond room temperature. The discovery of tunable ferromagnetism in Fe3GeTe2 materials opens up vast opportunities for utilizing vdW magnets in room-temperature spintronics devices.