کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1802823 1024605 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic properties of disordered ferrite and ilmenite-hematite thin films
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Magnetic properties of disordered ferrite and ilmenite-hematite thin films
چکیده انگلیسی
We have synthesized thin films of disordered zinc ferrite (ZnFe2O4) and ilmenite-hematite (FeTiO3-Fe2O3) solid solution, the former and the latter of which are interesting from the viewpoints of magnetooptics and spintronics, respectively, by utilizing sputtering and pulsed laser deposition methods, and have explored their magnetic, magnetooptical, and electrical properties. Although ZnFe2O4 possesses a normal spinel structure as its stable phase, some of the Fe3+ ions occupy the tetrahedral as well as the octahedral sites in ZnFe2O4 of which the sputtered thin film is composed. Consequently, the as-deposited thin film manifests large magnetization even at room temperature although the magnetic phase transition temperature of the stable phase of ZnFe2O4 is as low as 10 K. Also, the thin film exhibits a cluster spin glass transition at a temperature as high as 325 K. Furthermore, the ZnFe2O4 thin films exhibit large Faraday effects at a wavelength of 400 nm or so. The ilmenite-hematite solid solution is one of the ferrimagnetic semiconductors. Most of the compositions possess Curie temperatures higher than room temperature, and the type of carrier can be tuned only by changing the composition. We have succeeded in synthesizing solid-solution thin films of various compositions grown epitaxially on sapphire substrates with a (0 0 0 1) plane, and have shown that the thin films are ferrimagnetic semiconductors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 321, Issue 7, April 2009, Pages 818-821
نویسندگان
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