- Tytuł:
- Morphology and Magnetic Coupling in ZnO:Co and ZnO:Ni Co-Doped with Li
- Autorzy:
-
Persson, C.
Jayakumar, O.
Sudakar, C.
Sudarsan, V.
Tyagi, A. - Powiązania:
- https://bibliotekanauki.pl/articles/1505447.pdf
- Data publikacji:
- 2011-02
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
71.20.Nr
71.55.Gs
75.50.-y - Opis:
- $Zn_{0.95}Co_{0.05}O$ 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.
- Źródło:
-
Acta Physica Polonica A; 2011, 119, 2; 95-98
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł