# (Nd,Sm,La)-Fe-B-based hot-deformed magnets with excellent comprehensive properties for variable flux permanent magnet motors

https://mdr.nims.go.jp/datasets/e9bf9cb5-88d3-41c6-8434-44754bd3d4c3

## File

- [Manuscript.docx](https://mdr.nims.go.jp/filesets/55ac0b6f-47cb-4783-a86c-37433e81a440/download) ([Detail](https://mdr.nims.go.jp/filesets/55ac0b6f-47cb-4783-a86c-37433e81a440.md))

## Id

e9bf9cb5-88d3-41c6-8434-44754bd3d4c3

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-12-09T00:41:17.525499Z

## Updated at

2024-12-10T07:55:46.255559Z

## Published at

2024-12-10T07:55:46.330407Z

## Doi

https://doi.org/10.48505/nims.5124

## First published url

https://doi.org/10.1016/j.actamat.2024.120387

## Date published

2024-09-12

## Recorded date published

2024-12

## Resource type

journal_article

## Manuscript type

authors_original

## Collection



## Title

- title: "(Nd,Sm,La)-Fe-B-based hot-deformed magnets with excellent comprehensive
    properties for variable flux permanent magnet motors"
  title_type: original
  lang: en

## Description

- description: An emerging motor type, the variable flux permanent magnet (VFPM) motor,
    has created a demand for permanent magnets with a new set of properties. These
    magnets must exhibit easily tunable magnetization, demanding for moderate coercivity
    values, low magnetizing fields, and first-order reversal curves (FORCs) with high
    flatness. In this work, we report that the doping of Sm and La in Nd-Fe-B-based
    hot-deformed magnet, followed by the Nd-Cu diffusion process, resulted in desirable
    magnetic properties, such as, a moderate coercivity (µ0Hc) of 0.55 T, a low magnetizing
    field (µ0Hmag) of 0.94 T and a high FORC flatness of 0.96, while maintaining a
    high remanence (µ0Mr) of 1.3 T. The FORC flatness achieved in this work is the
    highest and the comprehensive properties are superior to the previously reported
    Nd-Fe-B magnets for VFPM motors. Microscopic investigations revealed that the
    high flatness achieved in this hot-deformed magnet is attributed to the formation
    of Fe-lean thick intergranular phases realized by Nd-Cu grain boundary diffusion.
    The overall combination of the magnetic properties for the diffusion processed
    (Nd,Sm,La)-Fe-B magnet is excellent, in comparison with a commercially available
    Sm2Co17-type magnet, showing the promise of the former for use in VFPM motors.
  description_type: abstract
  lang: en

## Creator

- name: A.K. Srinithi
  role: author
  organization: National Institute for Materials Science
- name: Xin Tang
  role: author
  orcid: https://orcid.org/0000-0001-6762-6145
  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: T. Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
  organization: National Institute for Materials Science
- name: K. Hono
  role: author
  orcid: https://orcid.org/0000-0001-7367-0193
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Elsvier

## Managing organization



## Keyword

- subject: Nd-Fe-B magnet, Coercivity First-order reversal curves Variable-flux permanent
    magnet motors
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Acta Materialia
  issn: '18732453'
  volume: '281'
  article_number: '120387'

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## Fileset

- id: 55ac0b6f-47cb-4783-a86c-37433e81a440
  filename: Manuscript.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 7925061
  md5: ed95be21d0dfa94e1dba81afea49a406

## Thumbnail

fileset_id: 55ac0b6f-47cb-4783-a86c-37433e81a440
filename: Manuscript.docx