# Atomic order induced reduction of Gilbert damping constant and enhancement of half-metallicity in off-stoichiometric Co2FeGa0.5Ge0.5 Heusler alloy thin films

https://mdr.nims.go.jp/datasets/134fac5c-4210-41b6-b418-fabc029da9cb

## File

- [JAP_2025_Atomic order induced reduction of Gilbert damping constant and enhancement of half-metallicity in off-stoichiometric Co2FeGa0.5Ge0.5 Heusler alloy thin films.pdf](https://mdr.nims.go.jp/filesets/d9229eb5-06d6-470e-a06e-34b81065b87b/download) ([Detail](https://mdr.nims.go.jp/filesets/d9229eb5-06d6-470e-a06e-34b81065b87b.md))

## Id

134fac5c-4210-41b6-b418-fabc029da9cb

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-10-24T01:52:26.569942Z

## Updated at

2025-10-28T03:30:08.348059Z

## Published at

2025-10-28T03:16:20.996333Z

## Doi



## First published url

https://doi.org/10.1063/5.0268776

## Date published

2025-07-28

## Recorded date published

2025-7-28

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Atomic order induced reduction of Gilbert damping constant and enhancement
    of half-metallicity in off-stoichiometric Co2FeGa0.5Ge0.5 Heusler alloy thin films
  title_type: original
  lang: en

## Description

- description: The development of energy-efficient spintronic devices with enhanced
    magnetoresistance demands materials with low Gilbert damping constant (α) and
    high half-metallicity. In this study, we report a very low α in sputter-deposited
    off-stoichiometric Co2FeGa0.5Ge0.5 (CFGG) Heusler alloy thin films and investigate
    the relation between α and atomic ordering and half-metallicity. CFGG thin films
    with a composition of Co44.3Fe30.7Ga13.9Ge11.1 were epitaxially deposited on MgO
    (001) substrates by magnetron sputtering followed by in situ annealing. The density
    of states calculations revealed that this composition has higher half-metallicity
    than the stoichiometric composition, owing to Fermi energy tuning. As-deposited
    and 400 °C-annealed samples exhibited B2-type partially disordered structure,
    while annealing above 500 °C induced a L21-type ordered structure. The improvement
    in atomic order resulted in the reduction of α, as demonstrated by ferromagnetic
    resonance measurement, and enhancement in half-metallicity, as revealed by anisotropic
    and ordinary magnetoresistance measurements. The 600 °C-annealed samples exhibited
    an intrinsic α of (3.5 ± 0.3) × 10−4, the low value reported for metallic ferromagnetic
    materials, demonstrating the potential for its use in energy-efficient spintronic
    devices.
  description_type: abstract
  lang: und

## Creator

- name: Madhav M. Bhat
  role: author
  orcid: https://orcid.org/0009-0006-1544-1337
- name: K. Simalaotao
  role: author
  orcid: https://orcid.org/0000-0002-6098-4422
  organization: National Institute for Materials Science
- name: H. Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
  organization: National Institute for Materials Science
- name: A. Perumal
  role: author
- name: A. Srinivasan
  role: author
- name: Y. Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: Spintronics
  schema: not_defined
- subject: Heusler alloys
  schema: not_defined
- subject: Ferromagnetic resonance,
  schema: not_defined
- subject: Gilbert damping
  schema: not_defined
- subject: Half-metallicity
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Applied Physics
  issn: '00218979'
  volume: '138'
  issue: '4'
  article_number: '043904'

## Conference



## Related item



## Funding

- funder_name: Advanced Storage Research Consortium
- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology
- identifier: JPJ011438
  funder_name: MEXT Initiative to Establish Next-generation Novel Integrated Circuits
    Centers

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: d9229eb5-06d6-470e-a06e-34b81065b87b
  filename: JAP_2025_Atomic order induced reduction of Gilbert damping constant and
    enhancement of half-metallicity in off-stoichiometric Co2FeGa0.5Ge0.5 Heusler
    alloy thin films.pdf
  content_type: application/pdf
  size: 2642505
  md5: 632df7d3ca71bb2eb31eec93837bf620

## Thumbnail

fileset_id: d9229eb5-06d6-470e-a06e-34b81065b87b
filename: JAP_2025_Atomic order induced reduction of Gilbert damping constant and
  enhancement of half-metallicity in off-stoichiometric Co2FeGa0.5Ge0.5 Heusler alloy
  thin films.pdf