Origin of the difference in spin-dependent transport properties between half-metallic <math>
  <mrow>
    <mi>C</mi>
    <msub>
      <mi>o</mi>
      <mn>2</mn>
    </msub>
    <mi>FeG</mi>
    <msub>
      <mi>a</mi>
      <mrow>
        <mn>0.5</mn>
      </mrow>
    </msub>
    <mi>G</mi>
    <msub>
      <mi>e</mi>
      <mrow>
        <mn>0.5</mn>
      </mrow>
    </msub>
  </mrow>
</math> and <math>
  <mrow>
    <mi>C</mi>
    <msub>
      <mi>o</mi>
      <mn>2</mn>
    </msub>
    <mi>M</mi>
    <msub>
      <mi>n</mi>
      <mrow>
        <mn>0.5</mn>
      </mrow>
    </msub>
    <mi>F</mi>
    <msub>
      <mi>e</mi>
      <mrow>
        <mn>0.5</mn>
      </mrow>
    </msub>
    <mi>Si</mi>
  </mrow>
</math> with the Ag spacer

Kodchakorn Simalaotao; Yoshio Miura; Yuya Sakuraba

doi:10.1103/physrevmaterials.8.104409

Article Origin of the difference in spin-dependent transport properties between half-metallic

C o_{2} FeG a_{0.5} G e_{0.5}

and

C o_{2} M n_{0.5} F e_{0.5} Si

with the Ag spacer

Kodchakorn Simalaotao (National Institute for Materials Science) ; Yoshio Miura (National Institute for Materials Science) ; Yuya Sakuraba (National Institute for Materials Science)

Revised-manuscript_PRM_2024_Paper1_final.pdf

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Citation

Kodchakorn Simalaotao, Yoshio Miura, Yuya Sakuraba. Origin of the difference in spin-dependent transport properties between half-metallic

C o_{2} FeG a_{0.5} G e_{0.5}

and

C o_{2} M n_{0.5} F e_{0.5} Si

with the Ag spacer. Physical Review Materials. 2024, 8 (10), 104409. https://doi.org/10.1103/physrevmaterials.8.104409

(BibTeX)

Description:

(abstract)

Current-perpendicular-to-plane giant magnetoresistive (CPP-GMR) devices are promising for next-generation magnetic read heads in hard disk drives due to their low resistance area product compared to tunnel magnetore sistive devices. While Co2FeGa0.5Ge0.5 (CFGG) and Co2Mn0.5Fe0.5Si (CMFS) are representative half-metallic Co-based Heusler alloys with experimentally observed high magnetoresistance (MR) in CPP-GMR with an Ag spacer, there is no understanding of the origin of the different band matching with the Ag spacer for the evaluation of ferromagnetic electrodes. In this study, first-principles calculations of the ballistic conductance in (001)-CFGG/Ag/CFGG and CMFS/Ag/CMFS were performed to clarify an origin of the difference in the spin-dependent conductance. We found that the majority-spin conductance of the CFGG/Ag(001) at its maximum was about 45% higher than that of the CMFS/Ag(001) over all interfacial terminations, indicating the advantageous potential of CFGG for achieving a larger MR ratio in CPP-GMR. A hybridization between the d states of the CFGG and the p states of the Ag plays an important role in the Fermi surface matching.

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In Copyright

©2025 American Physical Society

Keyword: half-metal, giant magnetoresistance, Heusler, spintronics

Date published: 2024-10-23

Publisher: American Physical Society (APS)

Journal:

Physical Review Materials (ISSN: 24759953) vol. 8 issue. 10 104409

Funding:

Japan Society for the Promotion of Science 21H01608
Ministry of Education, Culture, Sports, Science and Technology JPJ011438
Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503
Japan Science and Technology Corporation JPMJCR21O1
National Institute for Materials Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5292

First published URL: https://doi.org/10.1103/physrevmaterials.8.104409

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Updated at: 2025-01-25 08:30:32 +0900

Published on MDR: 2025-01-25 08:30:32 +0900

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