Bulk Spin Polarization of Co(1-x)FexS2

C. Utfeld; S. R. Giblin; J. W. Taylor; J. A. Duffy; C. Shenton-Taylor; J. Laverock; S. B. Dugdale; M. Manno; C. Leighton; M. Itou; Y. Sakurai

doi:10.1103/PhysRevLett.103.226403

Bulk Spin Polarization of Co(1-x)FexS2

C. Utfeld, S. R. Giblin, J. W. Taylor, J. A. Duffy, C. Shenton-Taylor, J. Laverock, S. B. Dugdale, M. Manno, C. Leighton, M. Itou, Y. Sakurai

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article

22 Scopus citations

Abstract

We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)FexS2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72±6% and P=18±7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (vF or vF2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on vF.

Original language	English (US)
Article number	226403
Journal	Physical review letters
Volume	103
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.103.226403
State	Published - Nov 25 2009

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Utfeld, C., Giblin, S. R., Taylor, J. W., Duffy, J. A., Shenton-Taylor, C., Laverock, J., Dugdale, S. B., Manno, M., Leighton, C., Itou, M., & Sakurai, Y. (2009). Bulk Spin Polarization of Co(1-x)FexS2. Physical review letters, 103(22), [226403]. https://doi.org/10.1103/PhysRevLett.103.226403

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title = "Bulk Spin Polarization of Co(1-x)FexS2",

abstract = "We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)FexS2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72±6% and P=18±7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (vF or vF2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on vF.",

author = "C. Utfeld and Giblin, {S. R.} and Taylor, {J. W.} and Duffy, {J. A.} and C. Shenton-Taylor and J. Laverock and Dugdale, {S. B.} and M. Manno and C. Leighton and M. Itou and Y. Sakurai",

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doi = "10.1103/PhysRevLett.103.226403",

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AU - Utfeld, C.

AU - Giblin, S. R.

AU - Taylor, J. W.

AU - Duffy, J. A.

AU - Shenton-Taylor, C.

AU - Laverock, J.

AU - Dugdale, S. B.

AU - Manno, M.

AU - Leighton, C.

AU - Itou, M.

AU - Sakurai, Y.

PY - 2009/11/25

Y1 - 2009/11/25

N2 - We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)FexS2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72±6% and P=18±7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (vF or vF2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on vF.

AB - We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)FexS2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72±6% and P=18±7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (vF or vF2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on vF.

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