纳米片
铁磁性
材料科学
反平行(数学)
纳米技术
凝聚态物理
光电子学
物理
磁场
磁化
量子力学
作者
Peng Wang,Jun‐Yi Ge,Jiawei Luo,Hao Wang,Luying Song,Zhongwei Li,Junbo Yang,Yuzhu Wang,Ruofan Du,Feng Wang,Jian Wang,Jun He,Jianping Shi
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-02-15
卷期号:23 (5): 1758-1766
被引量:12
标识
DOI:10.1021/acs.nanolett.2c04535
摘要
Two-dimensional (2D) nanosheet arrays with unidirectional orientations are of great significance for synthesizing wafer-scale single crystals. Although great efforts have been devoted, the growth of atomically thin magnetic nanosheet arrays and single crystals is still unaddressed. Here we design an interisland-distance-mediated chemical vapor deposition strategy to synthesize centimeter-scale atomically thin Fe3O4 arrays with unidirectional orientations on mica. The unidirectional alignment of nearly all the Fe3O4 nanosheets is driven by a dual-coupling-guided growth mechanism. The Fe3O4/mica interlayer interaction induces two preferred antiparallel orientations, whereas the interisland interaction of Fe3O4 breaks the energy degeneracy of antiparallel orientations. The room-temperature long-range ferrimagnetic order and thickness-tunable magnetic domain evolution are uncovered in atomically thin Fe3O4. This strategy to tune the orientations of nanosheets through the an interisland interaction can guide the synthesis of other 2D transition-metal oxides, thereby laying a solid foundation for future spintronic device applications at the integration level.
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