کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1803261 | 1024614 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Formation and ordering of local magnetic moments in Fe–Al alloys Formation and ordering of local magnetic moments in Fe–Al alloys](/preview/png/1803261.png)
The density functional theory is used to study the local magnetic moments in Fe–Al alloys depending on concentration (from 29 to 44 at% Al) and the Fe nearest environment. We have found three different solutions for the system: a spin-spiral wave (SSW) which has a minimum energy and two collinear states, a ferromagnetic one and a state with both positive and negative Fe magnetic moments (the Fe atoms with many neighboring Al atoms around them have negative magnetic moments, while the other Fe atoms—positive). Both the SSW and the negative Fe moments agree with the experiments. Magnetization curves taken from the literature are analyzed. The assumption of percolation character of the size distribution of magnetic clusters describes well the experimental superparamagnetic behavior above 150 K.
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issue 13, July 2008, Pages 1904–1908