# High-throughput evaluation of half-metallicity of Co            <sub>2</sub>            MnSi Heusler alloys using composition-spread films and spin-integrated hard X-ray photoelectron spectroscopy

https://mdr.nims.go.jp/datasets/d2803d74-ebe0-40dc-99ed-dfd395b638fd

## File

- [STAM_26(2025)2439781_Toyama.pdf](https://mdr.nims.go.jp/filesets/7fc1fb44-0ad2-4bfc-a662-35328da1b8dd/download) ([Detail](https://mdr.nims.go.jp/filesets/7fc1fb44-0ad2-4bfc-a662-35328da1b8dd.md))

## Id

d2803d74-ebe0-40dc-99ed-dfd395b638fd

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-25T06:45:27.094243Z

## Updated at

2025-12-24T08:27:29.264119Z

## Published at

2025-12-24T23:19:49.437325Z

## Doi



## First published url

https://doi.org/10.1080/14686996.2024.2439781

## Date published

2025-12-31

## Recorded date published

2025-12-31

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: High-throughput evaluation of half-metallicity of Co            <sub>2</sub>            MnSi
    Heusler alloys using composition-spread films and spin-integrated hard X-ray photoelectron
    spectroscopy
  title_type: original
  lang: en

## Description

- description: We demonstrate high-throughput evaluation of the half-metallicity of
    Co2MnSi Heusler alloys by spin-integrated hard X-ray photoelectron spectroscopy
    (HAXPES) of composition-spread films performed with high-brilliance synchrotron
    radiation at NanoTerasu, which identifies the optimum composition showing the
    best half-metallicity. Co75–xMnxSi25 composition-spread thin films for x = 10–40%
    with a thickness of 30 nm are fabricated on MgO(100) substrates using combinatorial
    sputtering technique. The L21-ordering and (001)-oriented epitaxial growth of
    Co2MnSi are confirmed by X-ray diffraction for x = 18–40%. The valence band HAXPES
    spectra exhibit a systematic compositional dependence and the smallest photoemission
    intensity at the Fermi level (EF) for a slightly Mn-rich composition of x = 27%.
    The density of states (DOS) for L21-ordered Co2MnSi with different Mn compositions
    obtained from first-principles calculation also show the smallest total DOS at
    EF for x = 27% because of the formation of a clear half-metallic gap in the minority
    spin channel and the less localized d-states in the majority spin channel, indicating
    the best half-metallic nature of this composition. Our experimental results demonstrate
    that high-throughput evaluation of half-metallicity is possible even with spin-integrated
    HAXPES by capturing systematic changes in the electronic structures through the
    measurements on the composition-spread film. Moreover, the anisotropic magnetoresistance
    (AMR) of the composition-spread film is measured for electric current directions
    along the [110] and [100] of Co2MnSi. Previous studies indicated that a larger
    negative AMR ratio is a signature of a higher spin polarization. The largest negative
    AMR ratio is observed for x = 27% for both current directions, which also supports
    the best half-metallicity for this off-stoichiometric composition.
  description_type: abstract
  lang: und

## Creator

- name: Ryo Toyama
  role: author
  orcid: https://orcid.org/0000-0002-7398-5803
  organization: National Institute for Materials Science
- name: Shunsuke Tsuda
  role: author
  orcid: https://orcid.org/0000-0001-6209-8048
  organization: National Institute for Materials Science
- name: Yuma Iwasaki
  role: author
  orcid: https://orcid.org/0000-0002-7117-277X
  organization: National Institute for Materials Science
- name: Thang Dinh Phan
  role: author
  orcid: https://orcid.org/0000-0002-2446-0453
  organization: National Institute for Materials Science
- name: Susumu Yamamoto
  role: author
- name: Hiroyuki Yamane
  role: author
- name: Koichiro Yaji
  role: author
  orcid: https://orcid.org/0000-0002-0721-1316
  organization: National Institute for Materials Science
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Informa UK Limited

## Managing organization



## Keyword

- subject: Heusler alloys
  schema: not_defined
- subject: half metallicity
  schema: not_defined
- subject: Co2MnSi
  schema: not_defined
- subject: composition-spread films
  schema: not_defined
- subject: hard X-ray photoelectron spectroscopy
  schema: not_defined
- subject: density of states
  schema: not_defined
- subject: anisotropic magnetoresistance effect
  schema: not_defined
- subject: NanoTerasu
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Science and Technology of Advanced Materials
  issn: '14686996'
  volume: '26'
  issue: '1'
  article_number: '2439781'

## Conference



## Related item



## Funding

- identifier: Digital Transformation Initiative Center for Magne
  funder_name: Research and Development

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: 7fc1fb44-0ad2-4bfc-a662-35328da1b8dd
  filename: STAM_26(2025)2439781_Toyama.pdf
  content_type: application/pdf
  size: 7828763
  md5: fd784775f0afb8641a3fec86c8472408

## Thumbnail

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filename: STAM_26(2025)2439781_Toyama.pdf