# Exchange-coupled <math display="inline">  <mi>Fe</mi></math>-<math display="inline">  <mi>Pt</mi></math>/<math display="inline">  <mi>Ru</mi></math>/<math display="inline">  <mi>Fe</mi></math>-<math display="inline">  <mi>Pt</mi></math> nanogranular films as potential heat-assisted-magnetic-recording media with reduced writing temperature

https://mdr.nims.go.jp/datasets/02c9db18-b811-453f-bc9b-d58ecd12cb3e

## File

- [NT10414.pdf](https://mdr.nims.go.jp/filesets/807fad67-6176-469d-ae59-af13c235e1c8/download) ([Detail](https://mdr.nims.go.jp/filesets/807fad67-6176-469d-ae59-af13c235e1c8.md))
- [241026 ogawa HighTcLowTc Supplimentary submit.pdf](https://mdr.nims.go.jp/filesets/9a31e7d5-9ac6-4003-be33-a2eaa58c841a/download) ([Detail](https://mdr.nims.go.jp/filesets/9a31e7d5-9ac6-4003-be33-a2eaa58c841a.md))

## Id

02c9db18-b811-453f-bc9b-d58ecd12cb3e

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-22T01:48:53.015195Z

## Updated at

2024-11-23T07:30:27.929485Z

## Published at

2024-11-23T07:30:28.038789Z

## Doi

https://doi.org/10.48505/nims.5018

## First published url

https://doi.org/10.1103/physrevapplied.22.054060

## Date published

2024-11-21

## Recorded date published

2024-11

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: "Exchange-coupled \n<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"
    display=\"inline\" overflow=\"scroll\"><mml:mi>Fe</mml:mi></mml:math>\n-\n<mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\" overflow=\"scroll\"><mml:mi>Pt</mml:mi></mml:math>\n/\n<mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\" overflow=\"scroll\"><mml:mi>Ru</mml:mi></mml:math>\n/\n<mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\" overflow=\"scroll\"><mml:mi>Fe</mml:mi></mml:math>\n-\n<mml:math
    xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\" overflow=\"scroll\"><mml:mi>Pt</mml:mi></mml:math>\n
    nanogranular films as potential heat-assisted-magnetic-recording media with reduced
    writing temperature"
  title_type: original
  lang: en

## Description

- description: Heat-assisted magnetic recording (HAMR) is a promising high-density
    data storage technology whose intensive practical deployment requires a perfect
    balance of many factors, including device reliability, which is challenged by
    severe writing conditions. In this work, we propose HAMR media composed of Fe-Pt/Ru/Fe-Pt
    trilayer nanograins embedded into a carbon segregating matrix. When the Ru nonmagnetic
    spacer is thinner than 2~nm, the Fe-Pt layers were found to be exchange-coupled
    and exhibit different Curie temperatures, which is beneficial for lowering the
    HAMR writing temperature. Given the grain size of 17~nm, sufficient thermal stability
    was preserved according to the time dependence of coercivity analyzed using the
    Sharrock equation. The granular microstructure of Fe-Pt/Ru/Fe-Pt films with different
    Ru thicknesses was examined in detail, while their magnetic properties were interpreted
    by micromagnetic simulations distinguishing the properties of individual Fe-Pt
    layers. Grain size reduction, suppression of in-plane variants, improvement of
    the degree of L10 order in the top Fe-Pt layer - all these are further steps to
    optimize the developed exchange-coupled Fe-Pt/Ru/Fe-Pt nanogranular films, that
    would open a new avenue for tuning the HAMR media toward its ultimate performance.
  description_type: abstract
  lang: und

## Creator

- name: Daisuke Ogawa
  role: author
  orcid: https://orcid.org/0009-0007-5388-6916
- name: Anton Bolyachkin
  role: author
  orcid: https://orcid.org/0000-0003-0420-1806
- name: Angayarkanni R. Dilipan
  role: author
  orcid: https://orcid.org/0000-0003-1859-1008
- name: Nikita Kulesh
  role: author
  orcid: https://orcid.org/0000-0001-7046-2671
- name: Hossein Sepehri-Amin
  role: author
  orcid: https://orcid.org/0000-0002-7856-7897
- name: Yukiko K. Takahashi
  role: author
  orcid: https://orcid.org/0000-0001-9197-7236

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Heat-assisted magnetic recording (HAMR)
  schema: not_defined
- subject: exchange-coupled media
  schema: not_defined
- subject: FePt
  schema: not_defined
- subject: Curie temperature
  schema: not_defined

## Rights

- description: "©2024 American Physical Society"
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



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## Embargo



## Journal

- title: Physical Review Applied
  issn: '23317019'
  volume: '22'
  issue: '5'
  article_number: '054060'

## Conference



## Related item



## Funding

- identifier: JPMJC22C3
  funder_name: JST CREST
- identifier: JPMXP1122715503
  funder_name: 'MEXT program '
  description: Data Creation and Utilization-Type Material Research and Development
    Project

## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Fileset

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  filename: NT10414.pdf
  content_type: application/pdf
  size: 3401944
  md5: f433581cac2a99d9c171e97932ab2d9a
- id: 9a31e7d5-9ac6-4003-be33-a2eaa58c841a
  filename: 241026 ogawa HighTcLowTc Supplimentary submit.pdf
  content_type: application/pdf
  size: 1874189
  md5: a143545bad428166c92961fabb7d533f

## Thumbnail

fileset_id: 9a31e7d5-9ac6-4003-be33-a2eaa58c841a
filename: 241026 ogawa HighTcLowTc Supplimentary submit.pdf