Sati P, Hayn R, Kuzian R, Régnier S, Schäfer S, Stepanov A, Morhain C, Deparis C, Laügt M, Goiran M, Golacki Z
Laboratoire Matériaux et Microélectronique de Provence, Case-142, Université d'Aix-Marseille III and CNRS, 13397, Marseille Cedex 20, France.
Phys Rev Lett. 2006 Jan 13;96(1):017203. doi: 10.1103/PhysRevLett.96.017203. Epub 2006 Jan 4.
We report on the magnetic properties of thoroughly characterized Zn(1-x)Co(x)O epitaxial thin films, with low Co concentration, x = 0.003-0.005. Magnetic and EPR measurements, combined with crystal field theory, reveal that isolated Co2+ ions in ZnO possess a strong single ion anisotropy which leads to an "easy plane" ferromagnetic state when the ferromagnetic Co-Co interaction is considered. We suggest that the peculiarities of the magnetization process of this state can be viewed as a signature of intrinsic ferromagnetism in ZnO:Co materials.
我们报道了具有低钴浓度（x = 0.003 - 0.005）的经过充分表征的Zn(1-x)Co(x)O外延薄膜的磁性。磁性和电子顺磁共振测量结合晶体场理论表明，ZnO中孤立的Co2+离子具有很强的单离子各向异性，当考虑铁磁Co-Co相互作用时，会导致“易平面”铁磁态。我们认为这种状态磁化过程的特性可被视为ZnO:Co材料中本征铁磁性的一个特征。
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