# Coercivity Engineering in Nd-Fe-B Hot-deformed Magnets by Grain Boundary Infiltration: Micromagnetic Viewpoint

https://mdr.nims.go.jp/datasets/50e67d20-b387-43cf-b0ae-27320837b2e1

## Files

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## Id

50e67d20-b387-43cf-b0ae-27320837b2e1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-10-13T04:58:45.265341Z

## Updated at

2024-10-16T07:30:42.399710Z

## Published at

2024-10-16T07:30:42.510328Z

## Doi

https://doi.org/10.48505/nims.4854

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## Resource type

conference_presentation

## Manuscript type

na

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## Title

- title: 'Coercivity Engineering in Nd-Fe-B Hot-deformed Magnets by Grain Boundary
    Infiltration: Micromagnetic Viewpoint'
  title_type: original
  lang: en

## Description

- description: The grain boundary diffusion process (GBDP) is one of the most efficient
    treatments for increasing the coercivity (Hc) of Nd-Fe-B magnets. However, this
    enhancement typically occurs at the expense of remanence (Mr). In this study,
    micromagnetic simulations were performed to quantify this tradeoff in hot-deformed
    Nd-Fe-B magnets subjected to the GBDP using a Nd-based eutectic alloy. The GBDP
    was imitated in a series of models with a gradually increasing volume fraction
    of the infiltrated Nd-rich nonmagnetic phase. The imitated infiltration reduced
    the remanence and grain connectivity via the remaining thin magnetic intergranular
    phase (IGP), which in turn increased the coercivity. We distinguished between
    the roles of exchange and magnetostatic interactions in this coercivity enhancement.
    Furthermore, the simulated Mr vs. Hc curves defined realistic limits for coercivity
    that depended on the IGP magnetization, which was estimated to be 0.9 ± 0.1 T
    by reproducing experimental Mr vs. Hc data from the literature.
  description_type: abstract
  lang: eng

## Creator

- name: BOLYACHKIN Anton
  role: author
  orcid: https://orcid.org/0000-0003-0420-1806
  organization: National Institute for Materials Science
  department: International Center for Young Scientists
  ror: https://ror.org/026v1ze26
- name: DENGINA Ekaterina
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Green Magnetic
    Materials Group
  ror: https://ror.org/026v1ze26
- name: SEPEHRI AMIN Hossein
  role: author
  orcid: https://orcid.org/0000-0002-7856-7897
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Green Magnetic
    Materials Group
  ror: https://ror.org/026v1ze26
- name: OHKUBO Tadakatsu
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials
  ror: https://ror.org/026v1ze26
- name: HONO Kazuhiro
  role: author
  orcid: https://orcid.org/0000-0001-7367-0193
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

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## Keyword

- subject: Nd-Fe-B magnets
  schema: not_defined
- subject: Micromagnetic simulations
  schema: not_defined
- subject: Grain boundary diffusion process
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

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## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: The 5th International Symposium on Advanced Magnetic Materials and Applications
  (ISAMMA2024)
start_date: 2024-08-04
end_date: 2024-08-07
identifier: https://isamma2024.vn/

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## Fileset

- id: 6f1d6110-97e5-4d72-8677-31559cb4e79e
  filename: abstarct.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 381069
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filename: abstarct.docx