کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9834093 | 1524906 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observation of a low Curie temperature ferromagnetic phase of ultrathin epitaxial Fe films on GaAs(0Â 0Â 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Observation of a low Curie temperature ferromagnetic phase of ultrathin epitaxial Fe films on GaAs(0Â 0Â 1) Observation of a low Curie temperature ferromagnetic phase of ultrathin epitaxial Fe films on GaAs(0Â 0Â 1)](/preview/png/9834093.png)
چکیده انگلیسی
The magnetic properties of epitaxial Fe films on GaAs in the range of the first few monolayers have been the subject of a considerable number of investigations in recent years. The absence of magnetic signatures at room temperature has been attributed to the existence of a magnetic 'dead' layer as well as superparamagnetism. By examining the temperature dependence of the magnetic linear dichroism of the Fe core level photoelectrons, we found a ferromagnetic regime with a Curie temperature, Tc substantially lower than room temperature, e.g., a Tc of about 240Â K for thin films of a nominal thickness of 0.9Â nm. The values of Curie temperature were sensitive to the initial GaAs substrate conditions and the thickness of the Fe over-layer with a layer of thickness of 1.25Â nm showing a Tc above room temperature. The data suggest that the thin Fe films on GaAs(0Â 0Â 1) may have ferromagnetic character at an earlier stage of growth than previously expected, although a weaker exchange interaction in the films leads to a substantial reduction in Curie temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 292, April 2005, Pages 241-247
Journal: Journal of Magnetism and Magnetic Materials - Volume 292, April 2005, Pages 241-247
نویسندگان
M. Spangenberg, J.R. Neal, T.-H. Shen, S.A. Morton, J.G. Tobin, G.D. Waddill, J.A.D. Matthew, D. Greig, A.E.R. Malins, E.A. Seddon, M. Hopkinson,