Abstract
The features of the structural, transport and magnetic properties of thin Zn1-xCoxOy films (x=0-0.45), fabricated on С-sapphire substrates by the pulsed laser deposition method are studied. It is found that the transport and ferromagnetic properties of the wurtzite Zn1-xCoxOy films nonmonotonously depend on Co concentration at room temperature. For the Zn0.87Co0.13Oy film, the strongest ferromagnetic signal is observed that is caused by formation of the greatest number of metallic Co clusters. A further increase of doping impurity concentration in the films leads to the oxidation of metallic Co and formation of the paramagnetic Co3O4 phase, in consequence of which the ferromagnetic signal subsides.
Highlights
An opportunity to control the charge carrier and its spin provided rapid evolution of spintronics and development of new materials with semiconducting and magnetic properties, and, as a result, will lead to development of new information technologies
Available theoretical estimations show that zinc oxide doped with 3d transition metals can be ferromagnetic, with a Curie temperature above room temperature, which makes the material attractive for semiconductor spintronics [1,2]
Some authors [3,4] watched gain of a ferromagnetic signal in Zn1-xCoxO films at increasing of cobalt concentration (x) while other authors [5] report about nonmonotonous dependence
Summary
An opportunity to control the charge carrier and its spin provided rapid evolution of spintronics and development of new materials with semiconducting and magnetic properties, and, as a result, will lead to development of new information technologies. Zinc oxide is one of the most promising materials thanks to its unique properties. Available theoretical estimations show that zinc oxide doped with 3d transition metals can be ferromagnetic, with a Curie temperature above room temperature, which makes the material attractive for semiconductor spintronics [1,2]. At present there is no single idea about the nature of a high-temperature ferromagnetism in thin Zn1-xCoxOy films. We have already demonstrated the ferromagnetic properties of thin Zn1-xCoxOy films at room temperature [6]. The purpose of present paper is investigation of oxygen deficiency effect on structural, transport and magnetic properties of thin Zn1-xCoxOy films in the range of cobalt concentration from 0 to 45 at.
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