# Enhancement of damping constant in Nd-doped L10-FePt at elevated temperarures for HAMR

https://mdr.nims.go.jp/datasets/aa31e159-fa9d-4bea-ae98-eaac052bbcee

## File

- [1-s2.0-S1359645426009249-main_Published.pdf](https://mdr.nims.go.jp/filesets/f03d0bbc-06d7-4594-8a5b-65d6072c2e40/download) ([Detail](https://mdr.nims.go.jp/filesets/f03d0bbc-06d7-4594-8a5b-65d6072c2e40.md))

## Id

aa31e159-fa9d-4bea-ae98-eaac052bbcee

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-10-09T01:26:53.230956Z

## Updated at

2026-10-09T04:07:09.795380Z

## Published at

2026-10-09T05:30:58.285269Z

## Doi



## First published url

https://doi.org/10.1016/j.actamat.2026.122826

## Date published

2026-09-29

## Recorded date published

2026-12

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Enhancement of damping constant in Nd-doped L10-FePt at elevated temperarures
    for HAMR
  title_type: original
  lang: en

## Description

- description: "Hard disk drives (HDDs) remain the primary large-capacity storage
    solution for data centers handling petabyte-scale AI data. Heat-assisted magnetic
    recording (HAMR) enables higher recording density by heating the recording layer
    near its Curie temperature (Tc) during writing. A sufficiently large Gilbert damping
    constant (α) at elevated temperatures is critical to suppress thermally driven
    back-switching and improve recording reliability.\r\nThis study investigates Nd-doped
    L1₀-FePt continuous thin films with Nd content ranging from 0.0 to 4.1 at.%. Microstructural
    analysis by XRD, STEM, and APT revealed that Nd is completely rejected from the
    FePt lattice and instead segregates into Fe-deficient void regions. Despite this,
    small amounts of Nd doping enhanced the anisotropy field (μ₀Hk), attributed to
    localized spin-orbit coupling (SOC) enhancement at FePt/Nd interfaces.\r\nMagnetization
    dynamics measured by TRMOKE from room temperature to near Tc showed that effective
    α near Tc increased from 0.048 (undoped) to 0.066 (4.1 at.% Nd), providing the
    first experimental demonstration of α enhancement through rare-earth doping in
    FePt. This enhancement is attributed to interfacial SOC effects, consistent with
    mechanisms reported in NiFe/rare-earth bilayer systems. These findings demonstrate
    that rare-earth doping can effectively modulate α in FePt-based HAMR media."
  description_type: abstract
  lang: eng

## Creator

- name: Aiko Sakoguchi
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Magnetic Recording
    Materials Group
- name: Yuta Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-9192-4799
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials
- name: Daisuke Ogawa
  role: author
  orcid: https://orcid.org/0000-0002-4373-6435
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Magnetic Recording
    Materials Group
- name: Jun Uzuhashi
  role: author
  orcid: https://orcid.org/0000-0003-2023-8158
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Digital Transformation
    Initiative Center for Magnetic Materials/Materials Characterization Group
- name: Hirofumi Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Semiconductor
    Materials Collaborative Hub
- name: Yukiko K. Takahashi
  role: author
  orcid: https://orcid.org/0000-0001-9197-7236
  organization: National Institute for Materials Science
  department: External Collaboration Division/WD-NIMS Center for Storage Frontier

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: FePt
  schema: not_defined
- subject: Hard disk drives
  schema: not_defined
- subject: Time resolved magneto optical Kerr effect
  schema: not_defined
- subject: magnetization dynamics
  schema: not_defined
- subject: perpendicular magnetic anisotropy
  schema: not_defined
- subject: Heat-assisted magnetic recording
  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: ACTA MATERIALIA
  issn: '13596454'
  volume: '321'
  article_number: '122826'

## Conference



## Related item



## Funding

- identifier: JPMXS0320230032
  funder_name: Government of Japan Ministry of Education Culture Sports Science and
    Technology
- identifier: 26K21737
  funder_name: Japan Society for the Promotion of Science
- funder_name: Advanced Storage Research Consortium
- identifier: JPMJCR22C3
  funder_name: Japan Science and Technology Agency

## 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: f03d0bbc-06d7-4594-8a5b-65d6072c2e40
  filename: 1-s2.0-S1359645426009249-main_Published.pdf
  content_type: application/pdf
  size: 4262952
  md5: 485f7aef545cd0e3f573f03ed7975ab0

## Thumbnail

fileset_id: f03d0bbc-06d7-4594-8a5b-65d6072c2e40
filename: 1-s2.0-S1359645426009249-main_Published.pdf