Amrillah Tahta, Quynh Le Thi, Nguyen Van Chien, Do Thi Hien, Arenholz Elke, Juang Jenh-Yih, Chu Ying-Hao
Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan.
Department of Nanotechnology, Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Surabaya 60115, Indonesia.
ACS Appl Mater Interfaces. 2021 Apr 14;13(14):17006-17012. doi: 10.1021/acsami.0c23104. Epub 2021 Mar 30.
Metastable ε-FeO is a unique phase of iron oxide, which exhibits a giant coercivity field. In this work, we grew epitaxial ε-FeO films on flexible two-dimensional muscovite substrates via quasi van der Waals epitaxy. It turns out that twinning and interface energies have been playing essential roles in stabilizing metastable ε-FeO on mica substrates. Moreover, the weak interfacial bonding between ε-FeO and mica is expected to relieve the substrate clamping effect ubiquitously encountered in films epitaxially grown on rigid substrates, such as SrTiO. It is anticipated that these flexible ε-FeO thin films can serve as a platform for exploring possible interesting emergent physical properties and eventually be integrated as flexible functional devices.
亚稳ε-FeO是一种独特的氧化铁相，具有巨大的矫顽力场。在这项工作中，我们通过准范德华外延在柔性二维白云母衬底上生长了外延ε-FeO薄膜。结果表明，孪晶和界面能在稳定云母衬底上的亚稳ε-FeO方面发挥了重要作用。此外，ε-FeO与云母之间较弱的界面键合有望缓解在诸如SrTiO等刚性衬底上外延生长的薄膜中普遍存在的衬底夹紧效应。预计这些柔性ε-FeO薄膜可作为探索可能有趣的新兴物理性质的平台，并最终集成成为柔性功能器件。
