铁磁性
居里温度
材料科学
自旋电子学
凝聚态物理
磁性
矫顽力
纳米技术
物理
作者
Jialing Liu,Si Wan,Bo Li,Bailing Li,Jingyi Liang,Ping Lü,Zucheng Zhang,Wei Li,Xin Li,Ying Huangfu,Ruixia Wu,Rong Song,Xiangdong Yang,Chang Liu,Ruohao Hong,Xiangfeng Duan,Jia Li,Xidong Duan
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-03-13
标识
DOI:10.1021/acs.nanolett.4c00321
摘要
The reduced dimensionality and interfacial effects in magnetic nanostructures open the feasibility to tailor magnetic ordering. Here, we report the synthesis of ultrathin metallic Co2Si nanoplates with a total thickness that is tunable to 2.2 nm. The interfacial magnetism coupled with the highly anisotropic nanoplate geometry leads to strong perpendicular magnetic anisotropy and robust hard ferromagnetism at room temperature, with a Curie temperature (TC) exceeding 950 K and a coercive field (HC) > 4.0 T at 3 K and 8750 Oe at 300 K. Theoretical calculations suggest that ferromagnetism originates from symmetry breaking and undercoordinated Co atoms at the Co2Si and SiO2 interface. With protection by the self-limiting intrinsic oxide, the interfacial ferromagnetism of the Co2Si nanoplates exhibits excellent environmental stability. The controllable growth of ambient stable Co2Si nanoplates as 2D hard ferromagnets could open exciting opportunities for fundamental studies and applications in Si-based spintronic devices.
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