# Room-temperature in-plane ferromagnetism in Co-substituted Fe<sub>5</sub>GeTe<sub>2</sub> investigated by magnetic x-ray spectroscopy and microscopy

https://mdr.nims.go.jp/datasets/63abb849-c296-45d9-ade5-c77666074b4f

## File

- [Heppell_2025_2D_Mater._12_025001.pdf](https://mdr.nims.go.jp/filesets/3a7aed5e-96c8-4c7d-a515-fad1e79c1b99/download) ([Detail](https://mdr.nims.go.jp/filesets/3a7aed5e-96c8-4c7d-a515-fad1e79c1b99.md))

## Id

63abb849-c296-45d9-ade5-c77666074b4f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-05-23T06:52:40.516496Z

## Updated at

2026-05-25T00:01:08.415975Z

## Published at

2026-05-25T01:29:19.594347Z

## Doi



## First published url

https://doi.org/10.1088/2053-1583/ada040

## Date published

2025-04-01

## Recorded date published

2025-4-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Room-temperature in-plane ferromagnetism in Co-substituted Fe<sub>5</sub>GeTe<sub>2</sub>
    investigated by magnetic x-ray spectroscopy and microscopy
  title_type: original
  lang: en

## Description

- description: 'The exploration of two-dimensional (2D) van der Waals ferromagnets
    has revealed intriguing magnetic properties with significant potential for spintronics
    applications. In this study, we examine the magnetic properties of Co-doped Fe5GeTe2
    using X- ray photoemission electron microscopy (XPEEM) and X-ray magnetic circular
    dichroism (XMCD), complemented by density functional theory (DFT) calculations.
    Our XPEEM measurements reveal that the Curie temperature (TC) of a bilayer of
    (Co0.25Fe0.75)5GeTe2 reaches ∼300K, a notable enhancement over other 2D ferromagnets
    in the ultra- thin limit. Interestingly, the TC shows minimal dependence on film
    thickness (bulk TC ≈ 310 K), aligning with the observed in-plane magnetic anisotropy
    and robust in- plane exchange coupling. XMCD measurements indicate that the spin
    moments for both Fe and Co are significantly reduced compared to the theoretical
    values. These in- sights provide a deeper understanding of the magnetic behavior
    of Co-doped Fe5GeTe2 and highlight its potential for stable, high-temperature
    ferromagnetic applications in 2D materials. '
  description_type: abstract
  lang: und

## Creator

- name: Emily Heppell
  role: author
- name: Ryuji Fujita
  role: author
- name: Gautam Gurung
  role: author
- name: Jheng-Cyuan Lin
  role: author
- name: Andrew F May
  role: author
- name: Michael Foerster
  role: author
- name: M Waqas Khaliq
  role: author
- name: Miguel Angel Niño
  role: author
- name: Manuel Valvidares
  role: author
- name: Javier Herrero-Martín
  role: author
- name: Pierluigi Gargiani
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Dirk Backes
  role: author
- name: Gerrit van der Laan
  role: author
- name: Thorsten Hesjedal
  role: author

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: 'room-temperature ferromagnetism
    '
  schema: not_defined
- subject: 'Fe5GeTe2
    '
  schema: not_defined
- subject: 2D ferromagnets
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-01-06

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: 2D Materials
  issn: '20531583'
  volume: '12'
  issue: '2'
  article_number: '025001'

## Conference



## Related item



## Funding

- funder_name: World Premier International Research Center Initiative
- funder_name: Oxford-ShanghaiTech collaboration project
- identifier: Materials Sciences and Engineering Division
  funder_name: Basic Energy Sciences
- identifier: EP/X015556/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: Materials Characterisation Laboratory
  funder_name: Diamond Light Source
- identifier: '2022097164'
  funder_name: ALBA Synchrotron
- identifier: 21H05233
  funder_name: Japan Society for the Promotion of Science

## 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: 3a7aed5e-96c8-4c7d-a515-fad1e79c1b99
  filename: Heppell_2025_2D_Mater._12_025001.pdf
  content_type: application/pdf
  size: 3187126
  md5: 3bd73fa3c678455675676659aa5dc872

## Thumbnail

fileset_id: 3a7aed5e-96c8-4c7d-a515-fad1e79c1b99
filename: Heppell_2025_2D_Mater._12_025001.pdf