ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The paper is devoted to the formation of the magnetic moments in the disordered transition metal-metalloid alloys. They are simple binary alloys Fe-Al, Fe-P, Fe-Si. The successful interpretation of the results by the modified Jaccarino-Walker models implicating the local magnetic moment conception corroborates the justification of the use of these models. Again, the description of the magnetism of transition metals by band calculations supports the need to use the collectivized electron model, based on the opposite concept to the local moment models. Certainly the consequent self-consistent first principle calculations within the framework of collectivized electron models are not possible today because of the technical difficulties of these tasks. Thus, we believe it is necessary to use simpler models that take into account the main details of the above-mentioned alloys. An s-d model of disordered binary alloy with the Hubbard electron interaction like that of Ref. 1 is considered in the paper. The dependence of the local magnetic moment on the number of nonmagnetic atoms in the nearest neighborhood is received in solving the self-consistent equation for the local magnetic moment. The model proposed allows us to qualitatively describe the experiments on the changes of the hyperfine field, isomer shift, and magnetization with concentration, and accounts for the appearance of the states with local and antiferromagnetic ordering. In spite of the band character of the model, the obtained dependencies of the local magnetic moment on the number of the neighboring nonmagnetic atoms weakly depend on the concentration, which gives the grounds for the conventional usage of the modified Jaccarino-Walker models in interpreting the experiment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.352567
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