Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4985237
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP17J01091]
- JSPS [25249087]
- Advanced Storage Technology Consortium (ASTC) of IDEMA
- ImPACT Program of Council for Science, Technology and Innovation, Japan
- Grants-in-Aid for Scientific Research [17J01091, 25249087] Funding Source: KAKEN
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We investigated the effect of Ti substitution for Fe in Co2FeSi Heusler alloy (Co2Fe1-xTixSi) on their electronic structure, chemical ordering, and spin-dependent transport properties. First-principles calculations of the density of states (DOS) indicated that the peak just above the Fermi level in the minority-spin DOS (the conduction band edge of half-metallic gap) shifts towards higher energies with increasing Ti, leading to the enhancement in the half-metallic gap and the spin-polarization. We found in epitaxial Co-2(Fe1-xTix)Si thin films that the required annealing temperature for long range L2(1)-ordering can be substantially reduced from 650 degrees C for Co2 FeSi to 400 degrees C for x >= 0.2. The enhancement of spin-polarization by the substitution of Fe with Ti was experimentally confirmed from anisotropic magnetoresistance measurements and spin-accumulation signals in non-local spin valve devices with the Co2Fe1-xTixSi films. Published by AIP Publishing.
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