# Large magnetoresistance and high spin-transfer torque efficiency of Co2Mn<i>x</i>Fe1−<i>x</i>Ge (0 ≤ <i>x</i> ≤ 1) Heusler alloy thin films obtained by high-throughput compositional optimization using combinatorially sputtered composition-gradient film

https://mdr.nims.go.jp/datasets/37da7acd-9d24-43f2-a9d5-d8b4fc65d333

## File

- [20250121_MDR_MS_Large MR and high STT achived in CMFG.pdf](https://mdr.nims.go.jp/filesets/31de319b-3cd2-4827-a107-f8578197bba4/download) ([Detail](https://mdr.nims.go.jp/filesets/31de319b-3cd2-4827-a107-f8578197bba4.md))

## Id

37da7acd-9d24-43f2-a9d5-d8b4fc65d333

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-01-21T07:48:39.124749Z

## Updated at

2025-03-14T04:30:16.343906Z

## Published at

2025-01-22T07:30:16.496581Z

## Doi

https://doi.org/10.48505/nims.5289

## First published url

https://doi.org/10.1063/5.0226638

## Date published

2024-11-01

## Recorded date published

2024-11-1

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Large magnetoresistance and high spin-transfer torque efficiency of Co2Mn<i>x</i>Fe1−<i>x</i>Ge
    (0 ≤ <i>x</i> ≤ 1) Heusler alloy thin films obtained by high-throughput compositional
    optimization using combinatorially sputtered composition-gradient film
  title_type: original
  lang: en

## Description

- description: Half-metallic ferromagnetic Heusler alloys having high spin polarization
    are promising candidates to realize large magnetoresistance (MR) ratio and high
    spin-transfer torque (STT) efficiency in next-generation spintronic devices. Since
    the Heusler alloy properties are sensitive to composition, optimizing the composition
    is crucial for enhancing device performance. Here, we report the fabrication of
    high-performance current-perpendicular-to-plane giant magnetoresistance (CPP-GMR)
    devices using Co2MnxFe1−xGe (0 ≤ x ≤ 1) Heusler alloy, employing a high-throughput
    and detailed composition optimization method. The method combined composition-gradient
    films and local measurements to enable the composition variation from Co2FeGe
    to Co2MnGe to be efficiently studied on a single library sample with a small composition
    interval. The CPP-GMR devices fabricated from stacks annealed at 250○C showed
    a clear composition dependence of MR with the maximum of MR ratio ∼38% in the
    Mn-rich region of x = 0.85. By increasing the annealing temperature to 350○C,
    the MR ratio increased to ∼45% along with high STT efficiency ∼0.6 in the broad
    composition range of 0.2 ≤ x ≤ 0.7. The optimal composition for the highest MR
    changed with annealing temperature because of the stability of the GMR stack being
    higher in the lower x range. The record high MR for the all-metal CPP-GMRdevices,
    at low annealing temperature of 250○C was achieved by the detailed composition
    optimization. These results present the high potential of Co2MnxFe1−xGe and provide
    a comprehensive guidance on the composition optimization for achieving large MR
    ratio and high STT efficiency in the CPP-GMR devices.
  description_type: abstract
  lang: und

## Creator

- name: Vineet Barwal
  role: author
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Hirofumi Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Ryo Toyama
  role: author
  orcid: https://orcid.org/0000-0002-7398-5803
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Kodchakorn Simalaotao
  role: author
  orcid: https://orcid.org/0000-0002-6098-4422
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Taisuke Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-5952-7638
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Yoshio Miura
  role: author
  orcid: https://orcid.org/0000-0002-5605-5452
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550
  organization: National Institute for Material Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: Spin-transfer-torque
  schema: not_defined
- subject: Spintronic devices
  schema: not_defined
- subject: Giant magnetoimpedance materials
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: APL Materials
  issn: 2166532X
  volume: '12'
  issue: '11'
  article_number: '111114'

## Conference



## Related item



## Funding

- funder_name: Advanced Storage Research Consortium
- identifier: JPMJCR2101
  funder_name: Japan Science and Technology Agency
- identifier: JPMXP1122715503
  funder_name: 'MEXT Program: Data Creation and Utilization Type Material Research
    and Development'
- identifier: JPJ011438
  funder_name: MEXT Intiative to Establish Next Generation Novel Intergrated Circuits
    Centers

## Instrument



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## Fileset

- id: 31de319b-3cd2-4827-a107-f8578197bba4
  filename: 20250121_MDR_MS_Large MR and high STT achived in CMFG.pdf
  content_type: application/pdf
  size: 3188770
  md5: 72d333c3d57a951ff18e58b4fc83fb73

## Thumbnail

fileset_id: 31de319b-3cd2-4827-a107-f8578197bba4
filename: 20250121_MDR_MS_Large MR and high STT achived in CMFG.pdf