# Quantitative estimation of coercive force of a magnetic grain by dynamical simulations

https://mdr.nims.go.jp/datasets/7c09aaa1-4427-499d-8b19-216f2fd38969

## File

- [Abstract_Nishino_PDSTM2023.pdf](https://mdr.nims.go.jp/filesets/ea5db55d-91e8-47bf-ad88-e2e7c111b69d/download) ([Detail](https://mdr.nims.go.jp/filesets/ea5db55d-91e8-47bf-ad88-e2e7c111b69d.md))

## Id

7c09aaa1-4427-499d-8b19-216f2fd38969

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## Visibility

open_to_public

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published

## Created at

2023-12-04T05:08:27.607685Z

## Updated at

2023-12-11T06:02:42.586052Z

## Published at

2023-12-12T04:30:17.641083Z

## Doi

https://doi.org/10.48505/nims.4300

## First published url



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## Resource type

conference_presentation

## Manuscript type

na

## Collection



## Title

- title: Quantitative estimation of coercive force of a magnetic grain by dynamical
    simulations
  title_type: original
  lang: en

## Description

- description: 'High coercivity is an important property of permanent magnets for
    application in energy conversion devices. Because coercivity is a long-time relaxation
    phenomenon, which originates from a strong metastable magnetic state, it is difficult
    to estimate coercive force (coercive field) studying the time evolution dynamics
    simulation of a model with atomistic parameters under the limitation of the simulation
    time. In our recent study, we presented a method to estimate coercivity using
    a statistical method to extend the limitation of simulation time and evaluated
    appropriately the coercive field of a single grain. In this presentation, we show
    a more convenient method to estimate coercivity using the field-dependent survival
    (nonreversal) probability generated by a time evolution simulation under a field
    sweep. This method is applied for any magnetic materials. In this method, not
    only coercive force but also the zero-field energy barrier and field for the zero-energy
    barrier can be estimated. Here, we demonstrate that the coercive field of a single
    grain of the neodymium (Nd) permanent magnet (Nd2Fe14B) is estimated. The Nd magnet
    is known as a high-coercivity magnet, which is used in various electronic devices,
    e.g., motors and efforts to increase the coercivity have been performed. We discuss
    detailed features of the estimation of the coercive force, zero-field energy barrier
    and field for the zero-energy barrier. '
  description_type: abstract
  lang: eng

## Creator

- name: 西野 正理
  role: author
  orcid: https://orcid.org/0000-0002-2060-2303
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials
    Field/Quantum Solid State Materials Group
  ror: https://ror.org/026v1ze26
- name: 宮下精二
  role: author
  organization: Graduate School of Science, The University fo Tokyo

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## Keyword

- subject: coercive force, magnetic grain, dynamical simulations, neodymium permanent
    magnet,  zero-field energy barrier, stochastic LLG simulations
  schema: not_defined

## Rights

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

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## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: Phase Transition and Dynamical Properties of Spin Transition Materials 2023
  (PDSTM2023)
start_date: 2023-11-26
end_date: 2023-11-30
identifier: https://smartconf.jp/content/pdstm2023

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## Fileset

- id: ea5db55d-91e8-47bf-ad88-e2e7c111b69d
  filename: Abstract_Nishino_PDSTM2023.pdf
  content_type: application/pdf
  size: 121556
  md5: cc9268d6572d177e9ac958d6f09875e5

## Thumbnail

fileset_id: ea5db55d-91e8-47bf-ad88-e2e7c111b69d
filename: Abstract_Nishino_PDSTM2023.pdf