Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan, 430072, P. R. China.
School of Materials Science and Engineering, Peking University, Beijing, 100871, P. R. China.
Adv Mater. 2023 May;35(18):e2211388. doi: 10.1002/adma.202211388. Epub 2023 Mar 17.
Magnetic materials in 2D have attracted widespread attention for their intriguing magnetic properties. 2D magnetic heterostructures can provide unprecedented opportunities for exploring fundamental physics and novel spintronic devices. Here, the heteroepitaxial growth of ferromagnetic CuCr Te nanosheets is reported on Cr Te and mica by chemical vapor deposition. Magneto-optical Kerr effect measurements reveal the thickness-dependent ferromagnetism of CuCr Te nanosheets on mica, where a decrease of Curie temperature (T ) from 320 to 260 K and an enhancement of perpendicular magnetic anisotropy with reducing thickness are observed. Moreover, lattice-matched heteroepitaxial ultrathin CuCr Te on Cr Te exhibits an enhanced robust ferromagnetism with T up to 340 K due to the interfacial charge transfer. Stripe-type magnetic domains and single magnetic domain are discovered in this heterostructure with different thicknesses. The work provides a way to construct robust room-temperature 2D magnetic heterostructures for functional spintronic devices.
二维磁性材料因其有趣的磁性能而引起了广泛的关注。二维磁性异质结构为探索基础物理和新型的自旋电子器件提供了前所未有的机会。在这里，通过化学气相沉积在 CrTe 和云母上报告了铁磁 CuCrTe 纳米片的异质外延生长。磁光克尔效应测量揭示了云母上 CuCrTe 纳米片的厚度依赖铁磁性，其中居里温度（T）从 320 降至 260 K，并且随着厚度的减小，垂直磁各向异性增强。此外，晶格匹配的异质外延超薄 CuCrTe 在 CrTe 上表现出增强的稳健铁磁性，T 高达 340 K，这归因于界面电荷转移。在具有不同厚度的这种异质结构中发现了条纹型磁畴和单磁畴。这项工作为构建用于功能性自旋电子器件的稳健室温二维磁性异质结构提供了一种方法。
