Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
87 (2000), S. 5887-5889
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The magnetic properties and the optical conductivity spectra of the ordered and disordered Co1−xAlx (x=0.5, 0.46, and 0.38) alloy films were measured. The ordered off-stoichiometric alloy films exhibit a ferromagnetic behavior and the magnetic property is enhanced when the disorderedness is introduced. The electronic band structures, magnetic moments, and optical conductivity spectra of the ordered Co1−xAlx (x=0.5, 0.4375, and 0.375) alloys were calculated using the linearized-muffin-tin-orbital method. The calculated magnetic moments were in a reasonable agreement with the experiments. Both the antistructure Co atoms and their neighboring eight Co atoms contribute to the magnetic moments. The charge transfer between Co and Al atoms is closely related to the magnetic behavior. The minority-spin bands of the antistructure Co atoms form a very intense and sharp density of states peak at the Fermi level, resulting in the magnetic moments. The evolution of the low-energy structures below 2 eV in the measured optical conductivity spectra upon decreasing the Al concentration is explained by an increased number of the antistructure Co atoms. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.372556
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