# Systematic investigation of anomalous Hall effect in Fe–Pt composition-spread epitaxial films for magnetic sensor application

https://mdr.nims.go.jp/datasets/f2a2aaa0-cd10-4ec5-b3d8-246759197cd4

## File

- [Systematic-investigation-of-anomalous-Hall effect-in-Fe-Pt-composition-spread-epitaxial-films.pdf](https://mdr.nims.go.jp/filesets/44142557-dfb3-4d5f-8f5c-bb6a12ba5a13/download) ([Detail](https://mdr.nims.go.jp/filesets/44142557-dfb3-4d5f-8f5c-bb6a12ba5a13.md))

## Id

f2a2aaa0-cd10-4ec5-b3d8-246759197cd4

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-28T01:06:33.554498Z

## Updated at

2025-08-28T07:30:31.606469Z

## Published at

2025-08-28T07:19:49.319445Z

## Doi

https://doi.org/10.48505/nims.5678

## First published url

https://doi.org/10.1063/5.0252936

## Date published

2025-02-14

## Recorded date published

2025-2-14

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Systematic investigation of anomalous Hall effect in Fe–Pt composition-spread
    epitaxial films for magnetic sensor application
  title_type: original
  lang: en

## Description

- description: Magnetic field sensors based on the anomalous Hall effect (AHE) require
    a magnetic thin film with high anomalous Hall resistivity and moderate perpendicular
    uniaxial magnetic anisotropy (Ku) to achieve both a large linear sensitivity and
    a dynamic range (DR) adaptable for various applications. In this study, we fabricate
    Fe1−xPtx composition-spread epitaxial thin films and systematically investigate
    the composition dependence of the AHE, aiming to achieve high sensitivity for
    the magnetic field sensors. We also explore the underlying physical mechanism
    of the AHE in the Fe–Pt binary system. Structural analysis reveals the [001]-oriented
    epitaxial growth, featuring distinct phases of A2-Fe, L12-Fe3Pt, L10-FePt, and
    L12-FePt3 as increasing x along with their mixed-phases, except for the Pt-rich
    region. Among the entire Fe1−xPtx, an off-stoichiometric Fe-rich composition Fe0.70Pt0.30
    exhibits the highest of 4.5 μΩ cm with a linear response to the external magnetic
    field and a DR of 600 mT, yielding a high sensitivity of 8 μΩ cm/T. The DR can
    be tuned in a wide range from 600 to 1400 mT by changing the Fe:Pt composition
    ratio, which is attributed to the variation in Ku and magnetization in the Fe–Pt
    binary alloy system. The anomalous Hall conductivity (AHC) shows an oscillatory
    variation with composition x, with the largest AHC of 1261 S/cm observed for Fe0.70Pt0.30.
    The theoretical calculation of the AHC for A2-Fe and L12-Fe3Pt, including the
    analysis of the density of states for the off-stoichiometric compositions, suggests
    that the overall variation in AHC with x can be mostly explained by an intrinsic
    mechanism and the electron doping effect introduced by Pt addition. Theoretical
    analysis supports that the highest sensitivity obtained in Fe0.70Pt0.30 originates
    from the large intrinsic AHC (1759 S/cm) predicted for L12-Fe3Pt.
  description_type: abstract
  lang: und

## Creator

- name: Akhilesh Kumar Patel
  role: author
  orcid: https://orcid.org/0000-0001-9718-8860
- name: Ryo Toyama
  role: author
  orcid: https://orcid.org/0000-0002-7398-5803
- name: Keisuke Masuda
  role: author
  orcid: https://orcid.org/0000-0002-6884-6390
- name: Kodchakorn Simalaotao
  role: author
  orcid: https://orcid.org/0000-0002-6098-4422
- name: Tomoya Nakatani
  role: author
  orcid: https://orcid.org/0000-0001-9590-216X
- name: Yoshio Miura
  role: author
  orcid: https://orcid.org/0000-0002-5605-5452
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: anomalous Hall effect
  schema: not_defined
- subject: magnetic sensor
  schema: not_defined
- subject: magnetic anisotropy
  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: Journal of Applied Physics
  issn: '00218979'
  volume: '137'
  issue: '6'
  article_number: '063901'

## Conference



## Related item



## Funding

- identifier: JPMXP112271
  funder_name: DX-mag
- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology
- identifier: JPMJER2201
  funder_name: ERATO
- identifier: JP21H01608
  funder_name: Japan Society for the Promotion of Science

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## Chemical composition



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## Fileset

- id: 44142557-dfb3-4d5f-8f5c-bb6a12ba5a13
  filename: Systematic-investigation-of-anomalous-Hall effect-in-Fe-Pt-composition-spread-epitaxial-films.pdf
  content_type: application/pdf
  size: 2000916
  md5: 2a6220ceb24d4e16e25ceec551a11573

## Thumbnail

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filename: Systematic-investigation-of-anomalous-Hall effect-in-Fe-Pt-composition-spread-epitaxial-films.pdf