Abstract
The paper presents the results of a study of the effect of pressure in a vacuum chamber on magnetic characteristics of Zn1-xLixOy thin films obtained by pulsed laser deposition on sapphire substrates as well as the results of elemental analysis across thickness of the samples. Secondary ion mass spectrometry demonstrated that the method of pulsed laser deposition allows for the synthesis of zinc oxide based thin films characterized by a high uniformity of elemental composition across thickness. It was established that different pressure in the vacuum chamber affects the number of oxygen vacancies in thin films, but not the distribution of elements across thin film thickness. Weak room temperature ferromagnetism was observed in Zn1-xLixOy thin films synthesized at a pressure of 3.15·10−5 Torr; it increases upon the increase in lithium concentration. Interstitial lithium atoms are considered to play a important role in its occurrence. The results of the study allow for expansion of the body of knowledge about the nature of room temperature ferromagnetism in zinc oxide based thin film structures as well as for developing technologies for high-quality thin film materials for recording and storing information.
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