Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
70 (1991), S. 6188-6188
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
In a certain concentration range the Fe-Al alloys undergo a complex magnetic transition.1,2 In this paper the magnetic phase diagram and behavior of Fe1−xAlx (x=29–34) alloys with the (Fe3Al)- and (FeAl)-type atomic order at low temperature have been investigated by alternating low-field susceptibility and steady-field magnetization measurements. The results have shown that the superparamagnetic transition of the alloys with (FeAl)- and (Fe3Al)-type crystal structure extend from 30.0 to slightly above 30.5 at. % Al and between 30.3 and 30.9 at. % Al, respectively. The type of ordered structure has an obvious influence on the freezing temperature Tf and reversed Curie temperature T0. The superparamagnetic range in the double transition with (FeAl)-type order is wider than those with (Fe3Al)-type order so that the magnetic phase diagram is moved in Fe-rich direction. The alloys with different type order have the different ranges of the multicritical point. It can be understood on the basis of the calculation that the ferromagnetic exchange is increased during the transition from (FeAl)- to (Fe3Al)-type ordered structure. The results are interpreted as the relative complete ability between the nearest-neighbor Fe-Fe ferromagnetic exchange and the further-neighbor Fe-Fe ferromagnetic exchange and the further-neighbor Fe-Al-Fe antiferromagnetic superexchange being changed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.350014
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