# Improvement in CPP-GMR read head sensor performance using [001]-oriented polycrystalline half-metallic Heusler alloy Co            <sub>2</sub>            FeGa            <sub>0.5</sub>            Ge            <sub>0.5</sub>            and CoFe bilayer electrode

https://mdr.nims.go.jp/datasets/20e62035-9a1c-44e4-b224-e298099f5980

## File

- [Improvement in CPP-GMR read head sensor performance using  001 -oriented polycrystalline half-metallic Heusler alloy Co2FeGa0.5Ge0.5 and CoFe bilayer -2.pdf](https://mdr.nims.go.jp/filesets/3ead769a-fcc1-49e5-96c5-d90cf0c2ac85/download) ([Detail](https://mdr.nims.go.jp/filesets/3ead769a-fcc1-49e5-96c5-d90cf0c2ac85.md))

## Id

20e62035-9a1c-44e4-b224-e298099f5980

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-01-06T05:23:18.587847Z

## Updated at

2025-01-07T07:30:56.923980Z

## Published at

2025-01-07T07:30:57.020385Z

## Doi



## First published url

https://doi.org/10.1080/14686996.2024.2388503

## Date published

2024-12-31

## Recorded date published

2024-12-31

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Improvement in CPP-GMR read head sensor performance using [001]-oriented
    polycrystalline half-metallic Heusler alloy Co            <sub>2</sub>            FeGa            <sub>0.5</sub>            Ge            <sub>0.5</sub>            and
    CoFe bilayer electrode
  title_type: original
  lang: en

## Description

- description: "A current-perpendicular-to-plane giant magnetoresistive (CPP-GMR)
    device with a half-metallic electrode is one of the most promising candidates
    of next-generation read head for hard disk drive. In this study, we fabricate
    [001]-oriented polycrystalline CPP-GMR devices with the normal ferromagnet (NFM)
    CoFe/half-metallic ferromagnet (HMFM) Co2FeGa0.5Ge0.5 (CFGG) bilayer electrodes
    to enhance the magnetoresistance (MR) ratio by large interfacial spin dependent
    scattering at the NFM/HMFM interface. The CoFe/CFGG bilayer electrode provides
    the additional large interfacial spin-dependent scattering and achieves high MR
    ratio of 22.7%  with the CoFe(4.5 nm)/CFGG(2.5 nm) bilayer electrodes, which is
    almost three(two) times larger\r\nthan the MR ratio with the single CoFe(CFGG)
    (7 nm) electrodes. The bias voltage dependent\r\nstudy revealed an additional
    advantage of increasing the output voltage |ΔV| by using the CoFe/CFGG bilayer
    due to the improvement of the endurance against spin-transfer torque under high
    bias current. A maximum output voltage jΔVjmax of 6.5 mV was obtained with the
    CoFe(5.5 nm)/CFGG(1.5 nm) electrodes, which is the highest ever reported in the
    CPP-GMR devices with a uniform metallic spacer including high-quality epitaxial
    devices."
  description_type: abstract
  lang: und

## Creator

- name: Dolly Taparia
  role: author
- name: Taisuke Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-5952-7638
  organization: National Institute for Materials Science
- name: Tomoya Nakatani
  role: author
  orcid: https://orcid.org/0000-0001-9590-216X
  organization: National Institute for Materials Science
- name: Hirofumi Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
  organization: National Institute for Materials Science
- name: Yoshio Miura
  role: author
  orcid: https://orcid.org/0000-0002-5605-5452
  organization: National Institute for Materials Science
- name: Zehao Li
  role: author
  organization: National Institute for Materials Science
- name: Varun Kumar Kushwaha
  role: author
  organization: National Institute for Materials Science
- name: Kazuumi Inubushi
  role: author
- name: Shinto Ichikawa
  role: author
- name: Katsuyuki Nakada
  role: author
- name: Tomoyuki Sasaki
  role: author
  organization: National Institute for Materials Science
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
  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: HDD
  schema: not_defined
- subject: CPP-GMR
  schema: not_defined
- subject: half-metal
  schema: not_defined
- subject: Heusler alloy
  schema: not_defined
- subject: read head
  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: '25'
  issue: '1'
  article_number: '2388503'

## Conference



## Related item



## Funding

- identifier: JPMJCR21O1
  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: 3ead769a-fcc1-49e5-96c5-d90cf0c2ac85
  filename: Improvement in CPP-GMR read head sensor performance using  001 -oriented
    polycrystalline half-metallic Heusler alloy Co2FeGa0.5Ge0.5 and CoFe bilayer -2.pdf
  content_type: application/pdf
  size: 6895652
  md5: e2fa212601f53f752616020c3e391548

## Thumbnail

fileset_id: 3ead769a-fcc1-49e5-96c5-d90cf0c2ac85
filename: Improvement in CPP-GMR read head sensor performance using  001 -oriented
  polycrystalline half-metallic Heusler alloy Co2FeGa0.5Ge0.5 and CoFe bilayer -2.pdf