# Searching for Cu-<i>X</i> spacers using a half-metallic Co<sub>2</sub>FeGa<sub>0.5</sub>Ge<sub>0.5</sub> electrode to boost magnetoresistance in CPP-GMR devices: a first-principles study

https://mdr.nims.go.jp/datasets/8d583935-541d-490f-85a2-adb88d19c9cb

## File

- [Final-revised2_manuscript_JPhysD-140195 (1).pdf](https://mdr.nims.go.jp/filesets/b273bb87-91e7-4569-af42-7c353dcdf632/download) ([Detail](https://mdr.nims.go.jp/filesets/b273bb87-91e7-4569-af42-7c353dcdf632.md))

## Id

8d583935-541d-490f-85a2-adb88d19c9cb

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-25T07:49:11.897414Z

## Updated at

2026-04-30T03:01:11.491392Z

## Published at

2026-09-23T23:37:00.855487Z

## Doi



## First published url

https://doi.org/10.1088/1361-6463/ae06ad

## Date published

2025-09-29

## Recorded date published

2025-9-29

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: 'Searching for Cu-<i>X</i> spacers using a half-metallic Co<sub>2</sub>FeGa<sub>0.5</sub>Ge<sub>0.5</sub>
    electrode to boost magnetoresistance in CPP-GMR devices: a first-principles study'
  title_type: original
  lang: en

## Description

- description: "Current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices
    are promising candidates for next-generation hard disk drive read heads due to
    their low resistance-area product and high-speed operation. This study investigates
    Cu-based binary alloys (Cu-X) as alternative spacers to conventional Ag spacer
    in Co2FeGa0.5Ge0.5 (CFGG)-based CPP-GMR devices using first-principles calculations.
    Majority-spin ballistic conductance, which is essential in the large spin-asymmetry
    of the interface resistance, was evaluated for CFGG/Cu-X/CFGG(001) trilayers in
    comparison with CFGG/Ag/CFGG(001) trilayer. The results show that several spacer
    materials have possibilities to enhance the MR ratio compared to Ag. In particular,
    we found that B2-CuZn will be the most suitable for CFGG electrode. The large
    majority-spin conductance of CFGG/CuZn/CFGG(001) is attributed to p-d hybridization
    between CFGG and Cu s-states near the Γ point, which enhances electron transport
    efficiency,\r\nwhile the thermal stability of the interface spin-moment at CFGG/CuZn(001)
    is slightly smaller than that of CFGG/Ag(001). Finally, we proposed that the insertion
    of Ag layer between the CFGG and CuZn interfaces will enhance not only the spin-asymmetry
    in the interface resistance but also the thermal stability of the interface spin-moment."
  description_type: abstract
  lang: und

## Creator

- name: Kodchakorn Simalaotao
  role: author
  orcid: https://orcid.org/0000-0002-6098-4422
- name: Ivan Kurniawan
  role: author
  orcid: https://orcid.org/0000-0001-5419-0047
- name: Yoshio Miura
  role: author
  orcid: https://orcid.org/0000-0002-5605-5452
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: CPP-GMR
  schema: not_defined
- subject: half-metal
  schema: not_defined
- subject: first principles calculation
  schema: not_defined
- subject: Heusler alloy
  schema: not_defined

## Rights

- description: 'This is the Accepted Manuscript version of an article accepted for
    publication in Journal of Physics D: Applied Physics.  IOP Publishing Ltd is not
    responsible for any errors or omissions in this version of the manuscript or any
    version derived from it.  The Version of Record is available online at https://doi.org/10.1088/1361-6463/ae06ad.'
  identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-09-24
end_date: 2026-09-24

## Journal

- title: 'Journal of Physics D: Applied Physics'
  issn: '00223727'
  volume: '58'
  issue: '39'
  start_page: 395303

## Conference



## Related item



## Funding

- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology
- identifier: JPJ011438
  funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: 21H01608
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



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## Process for specimen treatment



## Computational method



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## Fileset

- id: b273bb87-91e7-4569-af42-7c353dcdf632
  filename: Final-revised2_manuscript_JPhysD-140195 (1).pdf
  content_type: application/pdf
  size: 3100298
  md5: 4634bfbb2a931b52d43973117ab8df5e

## Thumbnail

fileset_id: b273bb87-91e7-4569-af42-7c353dcdf632
filename: Final-revised2_manuscript_JPhysD-140195 (1).pdf