# Altermagnetism and Weak Ferromagnetism

https://mdr.nims.go.jp/datasets/37d32b87-2681-40b6-84ec-49062ffdc9ef

## File

- [solovyev-oral_abst.pdf](https://mdr.nims.go.jp/filesets/ef5b10b1-23d2-4bbc-98f7-e45d0b8482b0/download) ([Detail](https://mdr.nims.go.jp/filesets/ef5b10b1-23d2-4bbc-98f7-e45d0b8482b0.md))

## Id

37d32b87-2681-40b6-84ec-49062ffdc9ef

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## Visibility

open_to_public

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published

## Created at

2025-12-10T01:56:44.618357Z

## Updated at

2025-12-22T02:37:04.776541Z

## Published at

2025-12-22T07:22:07.038574Z

## Doi

https://doi.org/10.48505/nims.6046

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## Resource type

conference_presentation

## Manuscript type

na

## Collection



## Title

- title: Altermagnetism and Weak Ferromagnetism
  title_type: original
  lang: en

## Description

- description: 'After briefly reviewing phenomenological theories, which have led
    to the prediction of anomalous Hall effect (AHE) in unconventional antiferromagnets,
    I will turn to the microscopic origin of these phenomena. Тhe key factor is the
    form of relativistic spin-orbit (SO) interaction in centrosymmetric lattices.
    The SO interaction in the bonds surrounding each magnetic site has components
    with the same sign as well as sign-alternating components. While the former are
    responsible for the weak spin ferromagnetism, the latter give rise to AHE. The
    SO interaction in the centrosymmetric lattice behaves as an antiferromagnetic
    object and changes its sign when moving from one magnetic sublattice to another.
    Thus, the SO interaction collaborates with the Nеel field: both obey the {S|t}
    symmetry, which combines the 180-degrees rotation of spins with the lattice shift
    t connecting antiferromagnetic sublattices. This {S|t} symmetry has dramatic consequences:
    (i) It preserves the spin degeneracy of the bands; (ii) Nevertheless, the time-reversal
    symmetry is broken, resulting in finite AHE; and (iii) The {S|t} symmetry allows
    us to use the generalized Bloch theorem and describe the unconventional antiferromagnet
    as a ferromagnet with one magnetic site per cell. This naturally explains the
    emergence of AHE in centrosymmetric antiferromagnets. '
  description_type: abstract
  lang: eng

## Creator

- name: SOLOVYEV Igor
  role: author
  orcid: https://orcid.org/0000-0002-2010-9877
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Quantum Materials
    Field/Quantum Materials Modeling Group

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## Keyword

- subject: antiferromagnetism
  schema: not_defined
- subject: time-reversal symmetry
  schema: not_defined
- subject: anomalous Hall effect
  schema: not_defined
- subject: orbital magnetization
  schema: not_defined
- subject: weak ferromagnetism
  schema: not_defined
- subject: altermagnetism
  schema: not_defined

## Rights

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

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## Embargo



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## Conference

name: The 17th TOYOTA RIKEN International Workshop Ruthenates and Emerging Quantum
  Materials (REQM2025)
start_date: 2025-12-02
end_date: 2025-12-06
identifier: https://sites.google.com/kyoto-u.ac.jp/reqm2025/

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## Fileset

- id: ef5b10b1-23d2-4bbc-98f7-e45d0b8482b0
  filename: solovyev-oral_abst.pdf
  content_type: application/pdf
  size: 15698
  md5: a118a0fd14ddeb77fb182e3e3522ad0c

## Thumbnail

fileset_id: ef5b10b1-23d2-4bbc-98f7-e45d0b8482b0
filename: solovyev-oral_abst.pdf