# Coercivity engineering in Sm(Fe0.8Co0.2)12B0.5 thin films by Si grain boundary diffusion

https://mdr.nims.go.jp/datasets/2c9701be-b9ab-45d9-8767-646932d5b1ba

## File

- [manuscript.docx](https://mdr.nims.go.jp/filesets/7d3e30de-41a6-4de5-aa25-12058984e811/download) ([Detail](https://mdr.nims.go.jp/filesets/7d3e30de-41a6-4de5-aa25-12058984e811.md))

## Id

2c9701be-b9ab-45d9-8767-646932d5b1ba

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-10-11T02:41:30.269910Z

## Updated at

2024-10-15T03:30:27.885577Z

## Published at

2024-10-15T03:30:28.122375Z

## Doi

https://doi.org/10.48505/nims.4847

## First published url

https://doi.org/10.1016/j.actamat.2022.117716

## Date published

2022-02-05

## Recorded date published

2022-4

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Coercivity engineering in Sm(Fe0.8Co0.2)12B0.5 thin films by Si grain boundary
    diffusion
  title_type: original
  lang: en

## Description

- description: Achieving a large coercivity in the SmFe12-based compounds with excellent
    intrinsic magnetic properties is the main challenge toward the development of
    new high-performance permanent magnets. In this study, we investigated the effect
    of microstructural factors on coercivity using Sm(Fe0.8Co0.2)12B0.5 thin films
    as a model system. The films were composed of columnar Sm(Fe0.8Co0.2)12 grains
    with [001] out-of-plane texture separated by ∼5 nm-thick (Fe,B)-rich amorphous
    intergranular phase. To decrease the Fe content in the intergranular phase and
    improve the magnetic isolation of Sm(Fe0.8Co0.2)12 grains, grain boundary diffusion
    of Si was performed, which led to an increase in coercivity from 1.11 T to a record
    high value of 1.32 T for the Sm(Fe0.8Co0.2)12 compound. Detailed microstructure
    characterization using scanning transmission electron microscopy (STEM) and atom
    probe tomography (APT) confirmed that Si diffused in-part into the intergranular
    phase which became depleted of Fe and Co. Micromagnetic simulations on a model
    constructed based on STEM images have shown that triple junctions of the intergranular
    phase can act as nucleation centers during demagnetization process. This detrimental
    effect can be suppressed by full-depth diffusion of Si weakening the ferromagnetism
    of the intergranular phase. However, the presence of α-(Fe,Co) grains at the interface
    with a V underlayer substantially reduces the benefits of grain boundary diffusion.
    Thus, high coercivity in the SmFe12-type magnets cannot be obtained unless the
    soft magnetic α-(Fe,Co) phases are eliminated.
  description_type: abstract
  lang: und

## Creator

- name: A. Bolyachkin
  role: author
  orcid: https://orcid.org/0000-0003-0420-1806
  organization: National Institute for Materials Science
- name: H. Sepehri-Amin
  role: author
  orcid: https://orcid.org/0000-0002-7856-7897
  organization: National Institute for Materials Science
- name: M. Kambayashi
  role: author
- name: Y. Mori
  role: author
- name: T. Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
  organization: National Institute for Materials Science
- name: Y.K. Takahashi
  role: author
  orcid: https://orcid.org/0000-0001-9197-7236
  organization: National Institute for Materials Science
- name: T. Shima
  role: author
- name: K. Hono
  role: author
  orcid: https://orcid.org/0000-0001-7367-0193
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Hard magnetic material
  schema: not_defined
- subject: SmFe12-based this film
  schema: not_defined
- subject: Coercivity
  schema: not_defined
- subject: Micromagnetic simulations
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2022-02-05
end_date: 2024-02-05

## Journal

- title: Acta Materialia
  issn: '13596454'
  volume: '227'
  article_number: '117716'

## Conference



## Related item



## Funding

- identifier: JPMXP0112101004
  funder_name: Ministry of Education, Culture, Sports, Science and Technology

## 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



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## Custom property



## Fileset

- id: 7d3e30de-41a6-4de5-aa25-12058984e811
  filename: manuscript.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 4269155
  md5: 644c958878c03a329435271133ec0378

## Thumbnail

fileset_id: 7d3e30de-41a6-4de5-aa25-12058984e811
filename: manuscript.docx