氮掺杂(1120)ZnO薄膜磁性质研究
Magnetic properties of N-doped(11■0) ZnO thin films
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摘要: 采用基于密度泛函理论(DFT)和局域密度近似(LDA)的第一性原理分析了氮掺杂(1120)ZnO薄膜的磁性质.首先,研究了一个N原子掺杂ZnO薄膜的磁性质,结果表明N2p,O2p和Zn3d发生自发自旋极化.其次,研究了二个N原子掺杂ZnO薄膜的磁性质,9个不同几何结构的计算结果表明N原子之间具有FM耦合稳定性,而且具体分析了N掺杂ZnO铁磁稳定性的产生原因.最后,讨论了氮掺杂ZnO磁交换系数和居里温度.计算结果表明N掺杂(1120)ZnO薄膜具有弱铁磁性.Abstract: By using the first principles method based on the density function theory (DFT) and the local density approximation (LDA), we study the ferromagnetic properties in N-doped(11 20) ZnO thin films. Magnetic properties in one-N-doped ZnO are investigated. The spontaneous spin polarization comes from N 2p, O 2p and Zn 3d. Magnetic properties in two-N-doped ZnO are also investigated. The calculated results show that ferromagnetism (FM) coupling between N atoms is more energetically favorable for nine geometrically distinct configurations. The origin of the FM state in N-doped ZnO is also discussed by analyzing the coupling of N levels. Finally, the magnetic exchange coefficient and the Curie temperature are discussed. The result indicates that N-doped ZnO thin films show weak FM properties.
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