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The magnetization distributions in some Heusler alloys proposed as half-metallic ferromagnets
journal contribution
posted on 2006-05-11, 13:35 authored by P.J. Brown, Klaus-Ulrich Neumann, P.J. Webster, K.R.A. ZiebeckThe magnetization distributions in a series of ternary intermetallic compounds based on
the composition Co2YZ where Y is Ti, Mn or Fe and Z a subgroup-B element have been determined
from polarized neutron diffraction measurements. Comparison of the magnetic structure factors
with model calculations shows that the magnetization is associated principally with those atoms
which in their elemental state are themselves magnetic. The observed deviations of the magnetic
moment distributions from spherical symmetry have been used to deduce which of the 3d sub-bands
are active at the Fermi energy. A small moment close to the limits of resolution is observed at some
of the Z sites, together with a small delocalized moment which in most cases is negative. The
results have been compared with the predictions of band models, which indicate that the Fermi
level falls in a broad minimum in the minority-spin density of d states. Although the identity
of the bands active at the Fermi surface is in broad agreement with predictions of band-structure
calculations (Ishida S, Akazawa S, Kubo Y and Ishida J 1982 J. Phys. F: Met. Phys. 12 1111),
the results suggest that there is a finite density of states in the minority-spin d band of manganese.
Hence the compounds cannot be classified as half-metallic ferromagnets.
History
School
- Science
Department
- Physics
Pages
85926 bytesCitation
BROWN et al, 2000. The magnetization distributions in some Heusler alloys proposed as half-metallic ferromagnets. Journal of Physics: Condensed Matter, 12(8), pp. 1827-1835Publisher
© Institute of PhysicsPublication date
2000Notes
This article has been published in the journal, Journal of Physics: Condensed Matter [© Institute of Physics]. It is available at: http://www.iop.org/EJ/journal/JPhysCM.ISSN
0953-8984Language
- en