| Autor: |
Ahmed I; Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mirs' Pakistan., Shuai Y; School of Energy Science and Engineering, Harbin Institute of Technology 92 West Dazhi Street Harbin 150001 PR China rafique@hit.edu.cn shuaiyong@hit.edu.cn., Rafique M; Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mirs' Pakistan.; School of Energy Science and Engineering, Harbin Institute of Technology 92 West Dazhi Street Harbin 150001 PR China rafique@hit.edu.cn shuaiyong@hit.edu.cn., Mahar MA; Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mirs' Pakistan.; Mehran University of Engineering and Technology Jamshoro Sindh Pakistan., Larik AS; Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mirs' Pakistan.; Mehran University of Engineering and Technology Jamshoro Sindh Pakistan. |
| Abstrakt: |
Adopting ab initio density functional theory (DFT) technique, the spintronic and opto-electronic characteristics of MnO x ( i.e. , Mn, MnO, MnO 2 , MnO 3 and MnO 4 ) clusters intercalated bilayer AlN (BL/AlN) systems are investigated in this paper. In terms of electron transfer, charge transfer occurs from BL/AlN to the MnO x clusters. MnO x clusters intercalation induces magnetic behavior in the non-magnetic AlN system. The splitting of electronic bands occurs, thus producing spintronic trends in the electronic structure of BL/AlN system. Further, MnO x intercalation converts insulating BL/AlN to a half metal/semiconductor material during spin up/down bands depending upon the type of impurity cluster present in its lattice. For instance, Mn, MnO and MnO 2 intercalation in BL/AlN produces a half metallic BL/AlN system as surface states are available at the Fermi Energy ( E F ) level for spin up and down band channels, accordingly. Whereas, MnO 3 and MnO 4 intercalation produces a conducting BL/AlN system having a 0.5 eV and 0.6 eV band gap during the spin down band channel, respectively. During spin up band channels these systems behave as semiconductors with band gaps of 1.4 eV and 1.2 eV, respectively. In terms of optical characteristics ( i.e. , absorption coefficient, reflectivity and energy loss spectrum (ELS)), it was found that MnO x intercalation improves the absorption spectrum in the low electron energy range and absorption peaks are observed in the 0-3 eV energy range, which are not present in the absorption spectrum of pure BL/AlN. The static reflectivity parameter of BL/AlN is increased after MnO x intercalation and the ELS parameter obtains significant peak intensities in the 0-2 eV energy range, whereas for pure BL/AlN, ELS contains negligible value in this energy range. Outcomes of this study indicate that, MnO x clusters intercalation in BL/AlN is a suitable technique to tailor its spintronic and opto-electronic trends. Thus, experimental investigation can be carried out on the systems discussed in this work, so as to fabricate practical layered AlN systems that are functional in the field of nano-technology.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.) |
