The formation and ordering of local magnetic moments in Fe-Al alloys

Details The formation and ordering of local magnetic moments in Fe-Al alloys The formation and ordering of local magnetic moments in Fe-Al alloys

2007-09-06

arxiv.org/abs/0709.0793v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures (presented in Third Seeheim Conference on Magnetism, 26-30 Aug. 2007, Frankfurt, Germany)

Scientific paper

10.1016/j.jmmm.2008.02.114

With density functional theory, studied are the local magnetic moments in Fe-Al alloys depending on concentration and Fe nearest environment. At zero temperature, the system can be in different states: ferromagnetic, antiferromagnetic and spin-spiral waves (SSW) which has a minimum energy. Both SSW and negative moment of Fe atoms with many Al atoms around them agree with experiments. Magnetization curves taken from literature are analysed. Assumption on percolation character of size distribution of magnetic clusters describes well the experimental superparamagnetic behaviour above 150 K.

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