Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-08-30
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 6 figures
Scientific paper
10.1088/0022-3727/40/21/004
Nitrogen embedded ZnO:N films prepared by pulsed laser deposition exhibit significant ferromagnetism. The nitrogen ions contained in ZnO confirmed by Secondary Ion Microscopic Spectrum and Raman experiments and the embedded nitrogen ions can be regarded as defects. According to the experiment results, a mechanism is proposed based on one of the electrons in the completely filled d-orbits of Zn that compensates the dangling bonds of nitrogen ions and leads to a net spin of one half in the Zn orbits. These one half spins strongly correlate with localized electrons that are captured by defects to form ferromagnetism. Eventually, the magnetism of nitrogen embedded ZnO:N films could be described by a bound magnetic polaron model.
Chou Hsiung
Lin Tzu-Jen
Sun Shih-Jye
Yu Chang-Feng
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