کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8149228 1524376 2016 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Cu doping on room temperature ferromagnetic behavior of Mn doped LiNbO3 films
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Effect of Cu doping on room temperature ferromagnetic behavior of Mn doped LiNbO3 films
چکیده انگلیسی
Cu and Mn co-doped LiNbO3 films were deposited on Si (111) substrates by rf-magnetron sputtering. XRD shows a randomly oriented polycrystalline R3C structure of LiNbO3 was formed in the films annealed at 1000 °C for 1 h in air. XPS and XAFS determine that Mn2+ substitutes on the Li site with a Li vacancy and Cu2+ substitutes on the Nb site with an oxygen vacancy in the LiNbO3 lattice. SQUID measurements indicate that all the films exhibit room temperature ferromagnetism, attributed to a strong d-d electron interaction between Mn and Nb and the bound magnetic polarons resulting from the oxygen vacancies. The saturated magnetization increases but the atom magnetic moment decreases with increasing Cu content in the films. The drop of the atom magnetic moment may arise from the antiferromagnetic coupling among adjacent Cu ions and an antiparallel configuration between Cu2+ ions and their trapped electrons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 453, 1 November 2016, Pages 198-202
نویسندگان
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