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Abstract:
The substitutional series of Heusler compounds Co2Mn1-xFexAl was
investigated by experimental and theoretical methods. In the experiments
a B2 type structure was found for the complete series by means of powder
x-ray diffraction. The magnetic moment increases with the Fe content
from about 4 mu(B) in Co2MnAl to above 5 mu(B) in Co2FeAl. All samples
exhibit a soft magnetic character. The Curie temperature is above 700K
and governed by structural changes. The magneto-structural properties,
as determined by Mossbauer spectroscopy, show that a statistical
distribution of the hyperfine fields appears rather than a single value.
The observed isomer shifts point to a transfer of charge between Mn and
Fe atoms depending on the Fe content. The experimental findings are well
supported by ab initio calculations of the electronic and magnetic
structure for disordered systems.
