# Impact of intergranular phase variations on the anomalous Nernst effect in Nd-Fe-B permanent magnets

https://mdr.nims.go.jp/datasets/c82f0434-85a2-4fb4-b6ba-1925e95c124f

## File

- [Manuscript-Final.docx](https://mdr.nims.go.jp/filesets/27299b66-23b0-4ef3-830c-cebd1369b831/download) ([Detail](https://mdr.nims.go.jp/filesets/27299b66-23b0-4ef3-830c-cebd1369b831.md))

## Id

c82f0434-85a2-4fb4-b6ba-1925e95c124f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-06-30T04:37:56.017992Z

## Updated at

2025-06-30T07:30:25.734395Z

## Published at

2025-06-30T07:18:13.484626Z

## Doi

https://doi.org/10.48505/nims.5552

## First published url

https://doi.org/10.20517/energymater.2025.26

## Date published

2025-06-26

## Recorded date published



## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Impact of intergranular phase variations on the anomalous Nernst effect in
    Nd-Fe-B permanent magnets
  title_type: original
  lang: en

## Description

- description: Improving the anomalous Nernst coefficient (SANE) in permanent magnets
    is essential for increasing the power density in transverse thermoelectric generators,
    which use permanent magnets to operate the anomalous Nernst effect without relying
    on an external magnetic field. While recent studies indicate that microstructural
    engineering can affect SANE, the specific relationship between microstructure
    and SANE in permanent magnets remains underexplored. This study investigates SANE
    of hot-pressed, hot-deformed, and RE-Cu (RE = Dy-Nd, Nd, and Pr) grain boundary
    diffusion-processed Nd-Fe-B magnets. The results show that SANE increases by 68%,
    from -2.6×10-7 VK-1 in the hot-pressed state to -4.4×10-7 VK-1 after hot-deformation
    in which grain growth and crystallographic texture are realized without changing
    the composition of the magnets. SANE further increases to -5.0×10-7 VK-1 after
    grain boundary structure and composition change from thin amorphous phase to thick
    crystalline phase by grain boundary diffusion of Dy-Nd-Cu alloy. The increase
    in SANE is found to be primarily due to the reduction of the opposing transverse
    electric field caused by the Seebeck-effect-induced carrier flow bent by the anomalous
    Hall effect. Owing to the crystallographic texture formation after hot-deformation,
    almost the same transverse thermopower as SANE is obtained in the hot-deformed
    and RE-Cu grain boundary diffusion-processed Nd-Fe-B magnets at a remanence state,
    i.e., under zero magnetic field. These findings demonstrate that microstructural
    optimization can effectively enhance the SANE in ultra-fine grained Nd-Fe-B magnets,
    providing a promising avenue for advancing materials in applications of transverse
    thermoelectrics.
  description_type: abstract
  lang: und

## Creator

- name: Zulfa Hilmi Kautsar
  role: author
  orcid: https://orcid.org/0000-0002-5318-9033
- name: Babu Madavali
  role: author
  orcid: https://orcid.org/0000-0002-8486-701X
- name: Takamasa Hirai
  role: author
  orcid: https://orcid.org/0000-0002-5577-8018
- name: Ken-ichi Uchida
  role: author
- name: Hossein Sepehri-Amin
  role: author
  orcid: https://orcid.org/0000-0002-7856-7897

## Contact agent



## Publisher

organization: OAE Publishing Inc.

## Managing organization



## Keyword

- subject: Anomalous Nernst effect
  schema: not_defined
- subject: hot-deformed magnets
  schema: not_defined
- subject: microstructural engineering
  schema: not_defined
- subject: permanent magnets
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Energy Materials
  issn: '27705900'
  volume: '5'
  issue: '10'

## Conference



## Related item



## Funding

- identifier: ERATO “Magnetic Thermal Management Materials” (Grant No. JPMJER2201)
  funder_name: JST-ERATO

## 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



## Software



## Custom property



## Fileset

- id: 27299b66-23b0-4ef3-830c-cebd1369b831
  filename: Manuscript-Final.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 4422582
  md5: cb8e2330a0f4e61e7625a88c300d25a7

## Thumbnail

fileset_id: 27299b66-23b0-4ef3-830c-cebd1369b831
filename: Manuscript-Final.docx