Novel Terahertz Properties of Nanostructured Mn[sub.3+0.53]Sn Films with Different Crystalline Orientations Driven by Ostwald Ripening on Ic/I-Al[sub.2]O[sub.3]

• Published in: Coatings (Basel) 2022-08, Vol.12 (8)
• Main Authors: Yang, Shaopeng, Wang, Xinyue, Wang, Qiujin, Xu, Tong, Wang, Qian, Guo, Jin, Zuo, Jian, Zhang, Cunlin, Xu, Wen, Song, Yujun, Liu, Ying, Wang, Jing, Wang, Hai
• Format: Article
• Language: English
• Subjects: Algebraic topology; Alloys; Analysis; Composition; Dielectric films; Properties; Terahertz radiation; Thin films; Topology
• ISSN: 2079-6412; 2079-6412
• DOI: 10.3390/coatings12081201

The characteristic energies of elementary excitations and collective modes in many quantum materials lie mostly in the terahertz (THz) frequency range, which provides a wide space for the development of THz optical materials and devices. In particular, topological Weyl semimetal Mn[sub.3] Sn is a noncollinear antiferromagnet with anomalous THz properties, which is strongly affected by thermal energy and external magnetic fields. Despite the explosive growth of the research on magnetic Weyl semimetals recently, its nanoscale structure for applications in THz optical devices remains to be explored. Here, we fabricated nanostructured Mn[sub.3+0.53] Sn films with different crystal orientations, driven by Ostwald Ripening (OR) on (0001) c-Al[sub.2] O[sub.3] . A huge anisotropic THz response manifested a firm link between the optical properties of Weyl antiferromagnet Mn[sub.3] Sn and its contrivable spin structures. The topological properties of Mn[sub.3] Sn are robustly protected in its nanostructures. This work can provide a new horizon for the fabrication of a nanostructured magnetic Weyl alloy and for its potential applications in subwavelength high-performance THz devices.