# Demagnetization Processes in Nd-Fe-B sintered and Ferrite Magnets derived from magnetic measurement and soft X-ray magnetic circular dichroism microscopy

https://mdr.nims.go.jp/datasets/d52e084a-cebd-4904-99d7-96b76376a148

## File

- [REPM2025_P1-51_Matsuura.pdf](https://mdr.nims.go.jp/filesets/9d0c3bf1-430e-4eee-90d4-6c38b82dd8ea/download) ([Detail](https://mdr.nims.go.jp/filesets/9d0c3bf1-430e-4eee-90d4-6c38b82dd8ea.md))

## Id

d52e084a-cebd-4904-99d7-96b76376a148

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-25T03:00:26.402279Z

## Updated at

2025-09-11T07:30:56.486298Z

## Published at

2025-09-11T07:20:20.468817Z

## Doi

https://doi.org/10.48505/nims.5668

## First published url



## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection

- id: d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  identifier: https://mdr.nims.go.jp/pid/d28f086a-61aa-4bc7-bcae-5a1078cbc6c7
  title: The 28th International Workshop on Rare Earth and Future Permanent Magnets
    and Their Applications (REPM2025)

## Title

- title: Demagnetization Processes in Nd-Fe-B sintered and Ferrite Magnets derived
    from magnetic measurement and soft X-ray magnetic circular dichroism microscopy
  title_type: original
  lang: en

## Description

- description: Demagnetization processes of Nd-Fe-B sintered and ferrite magnets were
    investigated via magnetic measurements and soft X-ray magnetic circular dichroism
    microscopy (XMCD). From the alignment dependence, the coercivities of these magnets
    were determined by magnetic domain wall motion because it decreased with improved
    alignment. The alignment dependence of coercivity varies according to the compositions
    and manufacturing methods due to the cluster sizes of demagnetization grains at
    their coercivity. The sizes increased with decreasing temperature and varied with
    composition. The continuous small demagnetization was observed in the recoil curve
    in a demagnetization field smaller than their coercivity. From XMCD, the magnetization
    reversal of individual particles was observed in a small demagnetization field,
    and clusters of demagnetization grains were formed from reversals of neighboring
    particles at the discretely demagnetized particle near its coercivity. The cluster
    growth yielded coercivity, and it was speculated that cluster sizes were related
    to their alignments and angular dependences of their coercivities. They also depended
    on the number of discretely demagnetized particles that occurred in a smaller
    demagnetization field than their coercivity.
  description_type: abstract
  lang: en

## Creator

- name: Yutaka Matsuura
  role: author
  organization: Research Institute for Applied Sciences, Japan

## Contact agent



## Publisher

organization: National Institute for Materials Science (NIMS)

## Managing organization



## Keyword

- subject: REPM2025
  schema: not_defined
- subject: Nd-Fe-B sintered magnet
  schema: not_defined
- subject: ferrite magnet
  schema: not_defined
- subject: demagnetization
  schema: not_defined
- subject: coercivity
  schema: not_defined
- subject: coercivity mechanism
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: REPM2025
start_date: 2025-07-27
end_date: 2025-07-31
identifier: https://www.nims.go.jp/mmu/repm2025/

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## Funding



## Instrument



## Instrument operator



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 9d0c3bf1-430e-4eee-90d4-6c38b82dd8ea
  filename: REPM2025_P1-51_Matsuura.pdf
  content_type: application/pdf
  size: 10166568
  md5: 63b364bef0ccf0e08466677a9e0b1a7a

## Thumbnail

fileset_id: 9d0c3bf1-430e-4eee-90d4-6c38b82dd8ea
filename: REPM2025_P1-51_Matsuura.pdf