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Competing magnetic effects due to the incorporation of oxygen in thin films of (ZnCo)O

机译：由于在（ZnCo）O薄膜中掺入氧气而产生的竞争性磁效应

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We have investigated the magnetic properties of ZnCoO thin films grown by pulsed laser deposition from targets made from pure ZnO combined with metallic Co, CoO or Co _(3) O _(4) as a function of oxygen pressure in the deposition chamber. We find that the structural and magnetic properties of films grown from targets containing CoO or Co _(3) O _(4) are similar and can be mapped on to each other by assuming that the films made from CoO require some additional oxygen to make them the same as those grown from Co _(3) O _(4) . The data suggest that the magnetism in these films is due to oxygen vacancies. Radically different properties are seen for the films grown with metallic Co in the target. In this case, there is structural evidence for the production of Zn vacancies as oxygen was added during deposition and this was accompanied by a strong increase of the magnetisation. In contrast, there was very little difference seen between the magnetic properties of the targets, which were all found to be paramagnetic, even after further annealing in air.
机译：我们已经研究了通过脉冲激光沉积从纯ZnO与金属Co，CoO或Co _（3）O _（4）结合制成的靶材上生长的ZnCoO薄膜的磁性能随沉积室中氧气压力的变化。我们发现，从包含CoO或Co _（3）O _（4）的靶材生长的薄膜的结构和磁性能相似，并且可以通过假设由CoO制成的薄膜需要一些额外的氧气来相互映射。它们与从Co _（3）O _（4）生长的那些相同。数据表明这些薄膜中的磁性是由于氧空位引起的。对于在靶中用金属Co生长的膜，看到了根本不同的性质。在这种情况下，有结构性证据表明在沉积过程中添加了氧气会产生Zn空位，并且伴随着磁化强度的强烈增加。相反，即使在空气中进一步退火后，靶材的磁性能之间也几乎没有差异，这些磁性能均被发现是顺磁性的。

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