# Er-driven magnetic tunability in FePt thin films investigated via high-throughput experiments and microstructure analysis for future HAMR media

https://mdr.nims.go.jp/datasets/7e7a6053-dcc9-4024-836f-d6089f2bd883

## File

- [2025 ogawa APL final.pdf](https://mdr.nims.go.jp/filesets/2339f839-3a47-4754-99bc-d8f783714a4e/download) ([Detail](https://mdr.nims.go.jp/filesets/2339f839-3a47-4754-99bc-d8f783714a4e.md))
- [2025 ogawa APL Supplementary.pdf](https://mdr.nims.go.jp/filesets/f558a82e-953e-4d2e-b563-da92e8d83129/download) ([Detail](https://mdr.nims.go.jp/filesets/f558a82e-953e-4d2e-b563-da92e8d83129.md))

## Id

7e7a6053-dcc9-4024-836f-d6089f2bd883

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-09T10:59:15.241120Z

## Updated at

2025-07-10T23:30:48.498249Z

## Published at

2025-07-10T23:16:43.550693Z

## Doi

https://doi.org/10.48505/nims.5576

## First published url

https://doi.org/10.1063/5.0273511

## Date published

2025-06-23

## Recorded date published

2025-6-23

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Er-driven magnetic tunability in FePt thin films investigated via high-throughput
    experiments and microstructure analysis for future HAMR media
  title_type: original
  lang: en

## Description

- description: 'This study undertakes comprehensive experimental validations based
    on theoretical predictions of the impact of Er and Tm doping on the magnetic properties
    of FePt thin films. Initial theoretical investigations indicate that doping with
    rare earth elements may result in promising alterations to the magnetic properties
    of the FePt thin films, with Er doping in particular offering a promising avenue
    for further study. Experimental synthesis via a combinatorial high-throughput
    sputtering system, which enables precise control over the composition of FePt
    thin films, achieves the desired magnetic properties. Small quantities of dopants,
    specifically 0.35 at. % Er, substantially enhance the key magnetic properties
    of saturation magnetization), anisotropy constant⁠ at room temperature, and the
    Curie temperature. Precise microstructural observations of a sample show that
    Er segregates at grain boundaries, voids, and the substrate/FePt interface, where
    Er preferentially replaces Fe sites. In other regions of the FePt grains, Er is
    not solid-soluble, and pure FePt and FePtEr form a composite material in the order
    of tens of nm. '
  description_type: abstract
  lang: und

## Creator

- name: Daisuke Ogawa
  role: author
  orcid: https://orcid.org/0000-0002-4373-6435
  organization: National Institute for Materials Science
- name: Yuma Iwasaki
  role: author
  orcid: https://orcid.org/0000-0002-7117-277X
  organization: National Institute for Materials Science
- name: Jun Uzuhashi
  role: author
  orcid: https://orcid.org/0000-0003-2023-8158
  organization: National Institute for Materials Science
- name: Yuta Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-9192-4799
  organization: National Institute for Materials Science
- name: Masato Kotsugi
  role: author
- name: Yukiko K. Takahashi
  role: author
  orcid: https://orcid.org/0000-0001-9197-7236
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: heat-assisted magnetic recording
  schema: not_defined
- subject: FePt
  schema: not_defined
- subject: combinatorial
  schema: not_defined
- subject: high throughput
  schema: not_defined
- subject: machine learning
  schema: not_defined
- subject: rare-earth doping
  schema: not_defined

## Rights

- description: 'This article may be downloaded for personal use only. Any other use
    requires prior permission of the author and AIP Publishing. This article appeared
    in Daisuke Ogawa, Yuma Iwasaki, Jun Uzuhashi, Yuta Sasaki, Masato Kotsugi, Yukiko
    K. Takahashi; Er-driven magnetic tunability in FePt thin films investigated via
    high-throughput experiments and microstructure analysis for future HAMR media.
    Appl. Phys. Lett. 23 June 2025; 126 (25): 252405 and may be found at https://doi.org/10.1063/5.0273511. '
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Applied Physics Letters
  issn: '00036951'
  volume: '126'
  issue: '25'
  article_number: '252405'

## Conference



## Related item



## Funding

- identifier: JPMXP1122715503
  funder_name: National Institute for Materials Science
- identifier: JPMJC22C3
  funder_name: Japan Science and Technology Agency
- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Fileset

- id: 2339f839-3a47-4754-99bc-d8f783714a4e
  filename: 2025 ogawa APL final.pdf
  content_type: application/pdf
  size: 3077489
  md5: 9ab9f283fed9b7e074d8c478541c0d4f
- id: f558a82e-953e-4d2e-b563-da92e8d83129
  filename: 2025 ogawa APL Supplementary.pdf
  content_type: application/pdf
  size: 249064
  md5: 5e17bf90268da393a074323daa74d860

## Thumbnail

fileset_id: 2339f839-3a47-4754-99bc-d8f783714a4e
filename: 2025 ogawa APL final.pdf