Huang Jijie, Li Leigang, Hu Zedong, Tsai Benson Kunhung, Huang Jialong, Shen Jianan, Zhang Yizhi, Barnard James P, Song Jiawei, Wang Haiyan
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States.
Nano Lett. 2024 Aug 21;24(33):10081-10089. doi: 10.1021/acs.nanolett.4c02036. Epub 2024 Aug 7.
Multifunctional vertically aligned nanocomposite (VAN) thin films exhibit considerable potential in diverse fields. Here, a BaTiO-FeCoNi alloy (BTO-FCN) system featuring an ultrathin ternary FCN alloy nanopillar array embedded in the BTO matrix has been developed with tailorable nanopillar size and interpillar distance. The magnetic alloy nanopillars combined with a ferroelectric oxide matrix present intriguing multifunctionality and coupling properties. The room-temperature magnetic response proves the soft magnet nature of the BTO-FCN films with magnetic anisotropy has been demonstrated. Furthermore, the anisotropic nature of the dielectric-metal alloy VAN renders it an ideal candidate for hyperbolic metamaterial (HMM), and the epsilon-near-zero (ENZ) wavelength, where the real part of permittivity () turns to negative, can be tailored from ∼700 nm to ∼1050 nm. Lastly, room-temperature multiferroicity has been demonstrated via interfacial coupling between the magnetic nanopillars and ferroelectric matrix.
多功能垂直排列纳米复合材料（VAN）薄膜在多个领域展现出巨大潜力。在此，已开发出一种BaTiO₃-FeCoNi合金（BTO-FCN）体系，其具有嵌入BTO基质中的超薄三元FCN合金纳米柱阵列，且纳米柱尺寸和柱间距可定制。磁性合金纳米柱与铁电氧化物基质相结合，呈现出引人入胜的多功能性和耦合特性。室温磁响应证明了具有磁各向异性的BTO-FCN薄膜的软磁性质。此外，介电-金属合金VAN的各向异性性质使其成为双曲线超材料（HMM）的理想候选材料，并且介电常数实部（ε）变为负值的近零介电常数（ENZ）波长可从约700纳米调整至约1050纳米。最后，通过磁性纳米柱与铁电基质之间的界面耦合，证明了室温下的多铁性。
