# Large anomalous Nernst conductivity of L1<sub>0</sub>-ordered CoPt in CoPt composition-spread thin films

https://mdr.nims.go.jp/datasets/93e98403-e6c9-42ba-80b3-9ebbc58ff9ef

## Files

- [R_Toyama_et_al_CoPt_20240420_Cleaned.pdf](https://mdr.nims.go.jp/filesets/b9c679f2-6559-4fab-afce-2dc328a39b53/download) ([Detail](https://mdr.nims.go.jp/filesets/b9c679f2-6559-4fab-afce-2dc328a39b53.md))
- [Supplementary Material_CoPt_20240310.pdf](https://mdr.nims.go.jp/filesets/3fbb76c3-5dc6-40d4-b1f0-0d55a8d54258/download) ([Detail](https://mdr.nims.go.jp/filesets/3fbb76c3-5dc6-40d4-b1f0-0d55a8d54258.md))

## Id

93e98403-e6c9-42ba-80b3-9ebbc58ff9ef

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-09-23T08:12:48.994351Z

## Updated at

2025-07-15T23:30:38.373687Z

## Published at

2025-07-15T23:17:09.084196Z

## Doi

https://doi.org/10.48505/nims.4794

## First published url

https://doi.org/10.1088/1361-6463/ad460e

## Date published

2024-10-11

## Recorded date published

2024-10-11

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Large anomalous Nernst conductivity of L1<sub>0</sub>-ordered CoPt in CoPt
    composition-spread thin films
  title_type: original
  lang: en

## Description

- description: We demonstrate a high-throughput experimental characterization of anomalous
    Nernst conductivity (αxy_A) of L10-ordered CoPt using Co1–xPtx composition-spread
    thin films on MgO(100) substrates. The compositional dependence of the anomalous
    Nernst effect (ANE), anomalous Hall effect (AHE) and Seebeck effect is systematically
    measured. As increasing the Pt concentration, the crystal structure in the composition-spread
    film grown at 500 °C changes from fcc Co, A1-disordered CoPt, L10-ordered CoPt,
    A1-CoPt to fcc Pt. The largest αxy_A of 2.52 A m–1 K–1 is obtained in L10-CoPt
    for Pt-rich composition of x = 70%, which is larger than that for an additionally
    fabricated nearly stoichiometric L10-Co48Pt52 reference uniform film. The contribution
    from direct conversion of a temperature gradient to a transverse charge current
    through αxy_A is dominant to the total anomalous Nernst coefficient compared to
    the AHE-related contribution. From a scaling analysis of the AHE, the intrinsic
    contribution is found to be dominant for x = 70%. A theoretical calculation for
    αxy_A of L10-Co50Pt50 agrees with the experimental αxy_A value for the nearly
    stoichiometric reference film by considering on-site Coulomb interaction for Co
    atoms. We also point out the possible electron doping effect by the addition of
    Pt in L10-CoPt, which could explain the larger αxy_A for the off-stoichiometric
    Pt-rich composition than that for the nearly stoichiometric one. Our experimental
    and theoretical results suggest the potential of L10-CoPt with a large αxy_A originating
    from the intrinsic mechanism for future thermoelectric applications.
  description_type: abstract
  lang: eng

## Creator

- name: Ryo Toyama
  role: author
  orcid: https://orcid.org/0000-0002-7398-5803
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Keisuke Masuda
  role: author
  orcid: https://orcid.org/0000-0002-6884-6390
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Kodchakorn Simalaotao
  role: author
  orcid: https://orcid.org/0000-0002-6098-4422
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Weinan Zhou
  role: author
  orcid: https://orcid.org/0000-0003-2946-9913
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Varun K Kushwaha
  role: author
  orcid: https://orcid.org/0000-0001-6344-4264
  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
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: anomalous Nernst conductivity
  schema: not_defined
- subject: anomalous Nernst effect
  schema: not_defined
- subject: L10-ordered alloy
  schema: not_defined
- subject: CoPt
  schema: not_defined
- subject: anomalous Hall effect
  schema: not_defined
- subject: composition-spread films
  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://dx.doi.org/10.1088/1361-6463/ad460e'
  identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-07-16
end_date: 2025-07-16

## Journal

- title: JOURNAL OF PHYSICS D-APPLIED PHYSICS
  issn: '13616463'
  volume: '57'
  issue: '40'
  start_page: 405001

## Conference



## Related item



## Funding

- identifier: JPMJER2201
  funder_name: Exploratory Research for Advanced Technology
- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology
- identifier: JP21H01608
  funder_name: Japan Society for the Promotion of Science
- identifier: JPMXP1122715503
  funder_name: Ministry of Education, Culture, Sports, Science and Technology

## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Fileset

- id: b9c679f2-6559-4fab-afce-2dc328a39b53
  filename: R_Toyama_et_al_CoPt_20240420_Cleaned.pdf
  content_type: application/pdf
  size: 1611223
  md5: 94f7069dc9d1b37cc3d68c234c32c3ca
- id: 3fbb76c3-5dc6-40d4-b1f0-0d55a8d54258
  filename: Supplementary Material_CoPt_20240310.pdf
  content_type: application/pdf
  size: 1593238
  md5: b14f5ad38002d7f2bc0854e12fb77163

## Thumbnail

fileset_id: 3fbb76c3-5dc6-40d4-b1f0-0d55a8d54258
filename: Supplementary Material_CoPt_20240310.pdf