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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Mechanism of ferromagnetism in non-magnetic ion-doped zinc oxides
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Mechanism of ferromagnetism in non-magnetic ion-doped zinc oxides

机译：非磁性离子掺杂氧化锌中的铁磁性机理

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摘要

Zinc oxide (ZnO) that contains non-magnetic ionic dopants, such as nitrogen (N)-doped zinc oxide (ZnO:N), has been observed to exhibit ferromagnetism. Ferromagnetism is proposed to arise from the Coulomb excitation in the localized states that is induced by the oxygen vacancy, V_O. A model based on the Coulomb excitation that is associated with the electron-phonon interaction theoretically explains the ferromagnetic mechanism of ZnO:N. This study reveals that the ferromagnetism will be induced by either deep localized states with a small V_O concentration or shallow localized states with a high V_O concentration. Additionally, electron-phonon coupling either suppresses the ferromagnetism that is induced by the deep donor states of V_O or enhances the ferromagnetism that is induced by the shallow donor states of V_O.
机译：已经观察到包含非磁性离子掺杂剂（例如掺氮（N）的氧化锌（ZnO：N））的氧化锌（ZnO）表现出铁磁性。提出铁磁性是由氧空位V_O引起的局域库仑激发引起的。基于库仑激发并与电子-声子相互作用相关的模型从理论上解释了ZnO：N的铁磁机理。这项研究表明，铁磁性将由具有较低V_O浓度的深局部状态或具有较高V_O浓度的浅局部状态引起。另外，电子-声子耦合要么抑制由V_O的深施主态感应的铁磁性，要么增强由V_O的浅供体态感应的铁磁性。

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