Journal
PHYSICAL REVIEW B
Volume 86, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.020409
Keywords
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Funding
- MEXT [21-09295]
- Japan Science and Technology (JST) agency
- Asahi Glass Foundation
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The anisotropic magnetoresistance (AMR) effect was systematically investigated in epitaxially grown Co2FexMn1-xSi films against Fe composition x and the annealing temperature. A change of sign in the AMR ratio from negative to positive was clearly detected when x increased from 0.6 to 0.8. This sign reversal can reasonably be explained by the change in the dominant s-d scattering process from s up arrow -> d up arrow to s up arrow -> d down arrow caused by the creation of large d-states at the Fermi level, suggesting the disappearance of half-metallicity at x = 0.8. The variations in the remanent density of states in the half-metallic gap against annealing temperature are also discussed from the viewpoint of the AMR ratio on the basis of the s-d scattering model.
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