Morphology and Magnetic Coupling in ZnO:Co and ZnO:Ni Co-Doped with Li

• Authors: C. Persson , O. Jayakumar , C. Sudakar , V. Sudarsan , A. Tyagi
• Languages of publication: EN

Abstracts

EN

Zn_{0.95}Co_{0.05}O and Zn_{0.97}Ni_{0.03}O nanorods, prepared by a solvothermal method, show intriguing morphology and magnetic properties when co-doped with Li. At low and moderate Li incorporation (below 10 and 3 at.% Li in the Co- and Ni-doped samples, respectively) the rod aspect ratio is increased and room temperature ferromagnetic properties are enhanced, whereas the ferromagnetic coupling in Zn_{0.97}Ni_{0.03}O is decreased for Li concentrations < 3 at.%. First-principles theoretical analyses demonstrate that Li co-doping has primarily two effects in bulk Zn_{1- x}M_{x}O (with M = Co or Ni). First, the Li-on-Zn acceptors increase the local magnetic moment by depopulating the M 3d minority spin-states. The magnetic coupling is Ruderman-Kittel-Kasuya-Yosida-like both without and with Li co-doping. Second, Li-on-Zn prefer to be close to the M atoms to compensate the M-O bonds and to locally depopulate the 3d states, and this will help forming high aspect nanostructures. The observed room temperature ferromagnetism in Li co-doped Zn_{1- x}M_{x}O nanorods can therefore be explained by the better rod morphology in combination with ionizing the magnetic M atoms.

Keywords

EN

71.20.Nr; 71.55.Gs; 75.50.-y

Discipline

• 75.50.-y: Studies of specific magnetic materials
• 71.55.Gs: II-VI semiconductors
• 71.20.Nr: Semiconductor compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 119
• Issue: 2
• Pages: 95-98

Dates

published

2011-02

Contributors

author

C. Persson

• Department of Materials Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
• Department of Physics, University of Oslo, P.O.Box 1048 Blindern, NO-0316 Oslo, Norway

author

O. Jayakumar

• Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India

author

C. Sudakar

• Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, USA

author

V. Sudarsan

• Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India

author

A. Tyagi

• Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India

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Identifiers

DOI

10.12693/APhysPolA.119.95