# Reducing critical current for spin-transfer-torque magnetization reversal in current-perpendicular-to-plane giant magnetoresistance devices using low damping and spin scattering asymmetry in Co2FeGa0.5Ge0.5 Heusler alloy

https://mdr.nims.go.jp/datasets/e02273da-d131-4de2-87ad-8cd9d10493d7

## File

- [Sci_rep_2026_Reducing critical current for spintransfer-torque magnetization reversal in current-perpendicularto-plane giant magnetoresistance devices using CFGG.pdf](https://mdr.nims.go.jp/filesets/3799134c-0381-4dd6-8a6e-a2a5055b8a6b/download) ([Detail](https://mdr.nims.go.jp/filesets/3799134c-0381-4dd6-8a6e-a2a5055b8a6b.md))

## Id

e02273da-d131-4de2-87ad-8cd9d10493d7

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-10T05:12:38.061229Z

## Updated at

2026-02-11T03:30:10.452136Z

## Published at

2026-02-11T01:00:15.994641Z

## Doi



## First published url

https://doi.org/10.1038/s41598-025-31714-7

## Date published

2025-12-18

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Reducing critical current for spin-transfer-torque magnetization reversal
    in current-perpendicular-to-plane giant magnetoresistance devices using low damping
    and spin scattering asymmetry in Co2FeGa0.5Ge0.5 Heusler alloy
  title_type: original
  lang: en

## Description

- description: Spin-transfer torque (STT) in magnetoresistance devices has enabled
    key applications such as STT-magnetoresistive random access memory, spin torque
    oscillators, and energy-assisted magnetic recording. In the device structures,
    where a free layer (FL) magnetization is manipulated by spin injection from a
    spin injection layer (SIL), the critical current density required for operation
    is directly proportional to the damping (α) constant of FL and inversely proportional
    to the STT efficiency, which depends on the spin polarization (P) of the materials.
    Here, we investigate the effect of low α and high P of Co2FeGa0.5Ge0.5 (CFGG)
    Heusler alloy on the operation current required for STT-induced magnetization
    reversal in current perpendicular-to-plane giant magnetoresistance devices. Devices
    with CFGG as a FL material achieved a large reduction in the operation current,
    as compared to those with conventional NiFe-FL owing to the very low α of CFGG,
    demonstrating the advantage of CFGG as a FL material. As the advantage of high
    spin polarization CFGG for SIL, we analyzed the effect of bilayer SIL consisting
    of CoFe and thin CFGG layers, focusing on utilizing the spin scattering asymmetry
    at the CoFe/CFGG interface. Devices with the CoFe/CFGG-SIL exhibited the lowest
    critical current, demonstrating enhanced STT efficiency. In addition, the correlation
    of STT efficiency with magnetoresistance ratio was comprehensively investigated,
    showing that device-to-device distribution in STT-efficiency was smaller in CoFe/CFGG-SIL.
    These findings highlight the potential of CFGG Heusler alloy and CoFe/CFGG bilayer
    structures as key components for the development of efficient and stable STT-based
    spintronic devices.
  description_type: abstract
  lang: und

## Creator

- name: Vineet Barwal
  role: author
- name: Hirofumi Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Heusler alloys
  schema: not_defined
- subject: Giant magnetoresistance
  schema: not_defined
- subject: Spin-transfer-torque
  schema: not_defined
- subject: Ferromagnetic resonance
  schema: not_defined
- subject: Gilbert damping
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Scientific Reports
  issn: '20452322'
  volume: '16'
  issue: '1'
  article_number: '1948'

## Conference



## Related item



## Funding

- funder_name: Advanced Storage Research Consortium
- identifier: JPJ011438
  funder_name: MEXT Initiative to Establish Next-generation Novel Integrated Circuits
    Centers
- identifier: JPJ011438
  funder_name: MEXT Initiative to Establish Next-generation Novel Integrated Circuits
    Centers
- 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



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## Computational method



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## Fileset

- id: 3799134c-0381-4dd6-8a6e-a2a5055b8a6b
  filename: Sci_rep_2026_Reducing critical current for spintransfer-torque magnetization
    reversal in current-perpendicularto-plane giant magnetoresistance devices using
    CFGG.pdf
  content_type: application/pdf
  size: 3962501
  md5: 9934d5ddc68518d804e754bd0f190fa5

## Thumbnail

fileset_id: 3799134c-0381-4dd6-8a6e-a2a5055b8a6b
filename: Sci_rep_2026_Reducing critical current for spintransfer-torque magnetization
  reversal in current-perpendicularto-plane giant magnetoresistance devices using
  CFGG.pdf