کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1555707 999114 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dilute magnetic oxides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد شیمی مواد
پیش نمایش صفحه اول مقاله
Dilute magnetic oxides
چکیده انگلیسی

Dilute magnetic oxides are transparent, wide-bandgap materials that behave ferromagnetically when doped with a few percent of a magnetic 3d cation. The magnetism, which appears well below the cation percolation threshold, cannot be understood in terms of the conventional theory of magnetism in insulators; nor can a carrier-mediated ferromagnetic exchange mechanism account for the magnitude of the Curie temperatures, which are well in excess of 400 K. The phenomenon is observed in thin films and nanocrystals, but not in well-crystallized bulk material. Experimental artefacts and segregation of secondary ferromagnetic phases can explain some observations, but the existence of a novel type of magnetism related to defects other than the magnetic dopants is a likely inference from the data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Opinion in Solid State and Materials Science - Volume 10, Issue 2, April 2006, Pages 83–92
نویسندگان
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