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Structural and magnetic studies of TiO2 rutile plates implanted with vanadium ionsстатья
- Авторы: Vakhitov I.R., Shemukhin A.A., Gumarov A.I., Lyadov N.M., Nuzhdin V.I., Faizrakhmanov I.A., Okay C., Rameev B.Z., Tagirov and Khaibullin R.I.L.R
- Журнал: Materials Research Express
- Том: 6
- Номер: 11
- Год издания: 2019
- DOI: 10.1088/2053-1591/ab447e
- Аннотация: Single crystal (100) and (001) TiO2 rutile plates were implanted with vanadium 40 keV ions to the fluence of 1.5×1017 ion/cm2. A set of samples was also annealed at high-temperature in air to restore oxygen stoichiometric content and recover the TiO2 lattice structure after the high-dose ion implantation. In addition, a control set of TiO2 rutile plates was implanted with 40 keV argon ions to the same fluence to explore the effect of radiation-induced defects on magnetic properties. Rutherford backscattering spectroscopy (RBS), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometry (VSM) measurements were carried out to characterize the structural and magnetic properties of the vanadium-implanted TiO2. Both as-implanted and subsequently annealed V-TiO2 samples reveal ferromagnetic response at room temperature. Strong ferromagnetism observed in the vanadium- implanted (001) TiO2 plates is related to the substitutional V4+ ions coupled by the indirect exchange via electrons trapped at oxygen vacancies, while much weaker ferromagnetism in the (100)-oriented plates and the Ar-implanted samples is attributed to lattice defects induced by the high-dose ion irradiation. Suppression of the ferromagnetic response in the vanadium-implanted (001) TiO2 after thermal treatment is explained by filling in the oxygen vacancies due to oxygen diffusion during annealing in air atmosphere.
- Добавил в систему: Шемухин Андрей Александрович