Evidence of ZnCO3 interstitial phase in carbon implanted ZnO(002) thin films and room temperature ferromagnetism. (February 2021)

• Record Type: Journal Article
• Authors: Gautam, Sanjeev; Thakur, Pardeep K.; Kumar, Shalendra; Singh, Ranber; Huang, Di-Jing; Kim, Younghak; Chae, Keun Hwa
• Is Part Of: Vacuum. Volume 184(2021)
• Publication Date: 2021-02
• Subjects: Ion implantation -- ZnO -- X-ray absorption spectroscopy -- X-ray linear dichroism; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2020.109897
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: High resolution X-ray diffraction (HRXRD) pattern of highly c-oriented (002) thin film provide a direct evidence of the formation of R-3c orthorhombic ZnCO3 structural phase. Room temperature ferromagnetism (RTFM) is measured using bulk vibrating sample magnetometery (VSM). A strong orbital anisotropy has been observed by X-ray linear dichroism (XLD) experiment, which also supports that ZnCO3 phase is structurally non-distortive after carbon-implantation. The absence of X-ray magnetic circular dichroism (XMCD) signal at O K- and C K-edges suggest that bulk VSM ferromagnetism is not related to the magnetic polarization of O 2 p /C 2 p orbitals hybridized with Zn-states. These experiments clearly indicate that the complex C–ZnO/ZnCO3 phase should be ferromagnetic having out-of-plane/in-plane orbital reconstruction. Highlights: Structural, and electronic/magnetic properties of Carbon implanted ZnO thin films. Observation of C–ZnO/ZnCO3 complex responsible for ferromagnetism having out-of-plane/in-plane orbital. VSM ferromagnetism is not related to the magnetic polarization of O 2p/C 2p orbitals hybridized with Zn-states.