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- W2314330190 abstract "By using the free-energy variational method based on the Bogoliubov inequality and a diluted and random-bond Ising model with nearest-neighbors interactions, we investigate the magnetic phase diagram and some of the magnetic properties of the disordered ${mathrm{Fe}}_{0.9ensuremath{-}q}{mathrm{Mn}}_{0.1}{mathrm{Al}}_{q}$ alloys system. Thus the mean magnetization per site, and hence the average hyperfine magnetic field, are computed. The so-obtained results are compared with room-temperature experimental data obtained by ${}^{57}mathrm{Fe}$ Mossbauer spectroscopy and vibrating sample magnetometry, from which a very good agreement is achieved. Here, the occurrence of a ``critical concentration'' at 40.0 at. % Al, for which the system passes from a ferromagnetically ordered state to a paramagnetic one, is evidenced. The model allows obtaining an estimate of the exchange energy between Fe-Fe pairs. How this energy depends on the Al concentration and the role of the manganese atoms is also presented and discussed." @default.
- W2314330190 created "2016-06-24" @default.
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- W2314330190 date "2000-03-01" @default.
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- W2314330190 title "Magnetic properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>0.9</mml:mn><mml:mi>−</mml:mi><mml:mi>q</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Al</mml:mi></mml:…" @default.
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- W2314330190 doi "https://doi.org/10.1103/physrevb.61.5880" @default.
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