Title :
Room temperature ferromagnetism of Zn0.92Co0.08O nanocrystalline thin film annealed in hydrogen atmosphere
Author :
He, Q. ; Hao Wang ; Wang, H.B. ; Wang, X.N. ; Zhang, J. ; Jiang, Y.
Author_Institution :
Fac. of Phys. & Electron. Technol., Hubei Univ., Wuhan, China
Abstract :
Zn0.92Co0.08O thin films annealed in hydrogen atmosphere have been prepared on Si (100) and quartz glass substrates by pulsed laser deposition using a ZnCoO ceramic target. The structural and magnetic properties of the films were investigated. X-ray diffraction, X-ray photoemission spectroscopy, high resolution transmission electron microscope and room-temperature UV-visible transmission spectrum analyses indicate that Co2+ substitute for Zn2+ without changing the wurtzite structure. Magnetic properties measurements reveal that the hydrogenized film show room-temperature ferromagnetism with a saturation magnetic moment of ~13 emu/cm3 and the Curie temperature is above 350 K. Our systematic studies show that oxygen vacancy constituted bound magnetic polarons is a promising candidate for the origin of room temperature ferromagnetism in this system.
Keywords :
Curie temperature; II-VI semiconductors; X-ray diffraction; X-ray photoelectron spectra; annealing; cobalt; ferromagnetic materials; magnetic moments; magnetic polarons; magnetic thin films; magnetisation; nanomagnetics; nanostructured materials; pulsed laser deposition; semiconductor growth; semiconductor thin films; semimagnetic semiconductors; transmission electron microscopy; ultraviolet spectra; vacancies (crystal); visible spectra; wide band gap semiconductors; zinc compounds; Curie temperature; Si; Si (100) substrate; SiO2; X-ray diffraction; X-ray photoemission spectroscopy; Zn0.92Co0.08O; annealing; bound magnetic polarons; high resolution transmission electron microscope; hydrogen atmosphere; hydrogenized film; magnetic properties; nanocrystalline thin film; oxygen vacancy; pulsed laser deposition; quartz glass substrate; room temperature ferromagnetism; room-temperature UV-visible transmission spectrum; saturation magnetic moment; structural properties; temperature 293 K to 298 K; wurtzite structure; Annealing; Atmosphere; Hydrogen; Magnetic films; Magnetic properties; Pulsed laser deposition; Semiconductor thin films; Sputtering; Temperature; Zinc;
Conference_Titel :
Nanoelectronics Conference (INEC), 2010 3rd International
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3543-2
Electronic_ISBN :
978-1-4244-3544-9
DOI :
10.1109/INEC.2010.5424993
