Title :
Structural and magnetic properties of co-doped (La,Sr)TiO3−δ nanocrystals
Author :
Peng Liu ; Xuefeng Wang ; Lixin Yang ; Fengqi Song ; Bin Liu ; Jianguo Wan ; Rong Zhang
Author_Institution :
Dept. of Phys., Soochow Univ., Suzhou, China
Abstract :
In this paper, we report on a structural and magnetic investigation of a series of Co-doped La0.4Sr0.6TiO3-δ DMS nanocrystals synthesized by a solvothermal technique [3] and subsequently treated by a high-temperature (800°C) annealing in Ar atmosphere. We found that no secondary phases or contaminations could be detected for samples with Co dopant concentration below 5 at %, indicating that the observed ferromagnetic signals are intrinsic in this strongly correlated system. The origin of magnetism could be correlated to the ferromagnetic coupling of Co dopant via the local charge-compensating oxygen vacancy F-center, which is different from the case of Co-doped ZnO [2,3].
Keywords :
F-centres; annealing; cobalt; ferromagnetic materials; lanthanum compounds; nanofabrication; nanomagnetics; nanostructured materials; strongly correlated electron systems; strontium compounds; vacancies (crystal); Ar atmosphere; Co dopant concentration; Co-doped DMS nanocrystals; La0.4Sr0.6TiO3-δ:Co; ferromagnetic coupling; ferromagnetic signals; high-temperature annealing; local charge-compensating oxygen vacancy F-center; magnetic properties; solvothermal technique; strongly correlated system; structural properties; temperature 800 degC;
Conference_Titel :
Vacuum Electron Sources Conference and Nanocarbon (IVESC), 2010 8th International
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-6645-0
DOI :
10.1109/IVESC.2010.5644184
