# High-Coercivity Spin Glasses in Anisotropic Mo                    <sub>2</sub>                    FeB                    <sub>2</sub>                    -Type M                    <sub>1.5</sub>                    Mn                    <sub>1.5</sub>                    B                    <sub>2</sub>                    (M = Mo, W)

https://mdr.nims.go.jp/datasets/c0b3fa0a-a46f-4435-a07d-f3ad3c0af99d

## File

- [M1.5Mn1.5B2-spin-glas_for_MDR.pdf](https://mdr.nims.go.jp/filesets/d3f248e1-0ac9-4bcc-8c10-e32746058437/download) ([Detail](https://mdr.nims.go.jp/filesets/d3f248e1-0ac9-4bcc-8c10-e32746058437.md))

## Id

c0b3fa0a-a46f-4435-a07d-f3ad3c0af99d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-07T00:43:50.122872Z

## Updated at

2026-04-30T03:01:11.491392Z

## Published at

2026-10-26T23:28:10.060273Z

## Doi

https://doi.org/10.48505/nims.5868

## First published url

https://doi.org/10.1021/jacs.5c12552

## Date published

2025-11-05

## Recorded date published

2025-11-5

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: High-Coercivity Spin Glasses in Anisotropic Mo                    <sub>2</sub>                    FeB                    <sub>2</sub>                    -Type
    M                    <sub>1.5</sub>                    Mn                    <sub>1.5</sub>                    B                    <sub>2</sub>                    (M
    = Mo, W)
  title_type: original
  lang: en

## Description

- description: Magnetic materials combining spin-glass behavior with hard-magnet coercivity
    are important for fundamental and applied research. Herein, we report spin glass
    behaviors coupled to remarkably large intrinsic coercivity values of 302.4 kA/m
    (Hc = 3.80 kOe) in Mo1.5Mn1.5B2 and 175.1 kA/m (Hc = 2.20 kOe) in W1.5Mn1.5B2.
    Both phases belong to the Mo2FeB2-type structure known for enabling excellent
    structural properties and predicted altermagnetic candidates. Single-phase products
    were obtained via a compositionally tuned solid-state route that resolves prior
    phase-purity challenges. Temperature-dependent susceptibility measurements revealed
    spin-glass behavior below the freezing temperatures Tg = 29 K for Mo1.5Mn1.5B2
    and Tg = 43 K (reentrant cluster spin glass) as well as a ferromagnetic (FM) transition
    at 70 K for W1.5Mn1.5B2. AC susceptibility measurements exhibited frequency-dependent
    peaks that shifted to higher temperatures with increasing frequency, confirming
    the presence of dynamic spin freezing in both compounds. DFT calculations confirmed
    the presence of strongly competing FM and antiferromagnetic (AFM) interactions
    leading to competing AFM/FM/FiM orderings with a greater spin-exchange energy
    (ΔEₑₓ = 28-98 meV/f.u.) for FiM/AFM compared to FM in Mo1.5Mn1.5B2 and even greater
    ΔEₑₓ = 53-131 meV/f.u. in W1.5Mn1.5B2. The magnetocrystalline anisotropy energy
    (MAE) is uniaxial, favoring the c-axis, with MAE = -0.17 meV/f.u. (Mo) and -0.10
    meV/f.u. (W), which align well with the large hysteresis found experimentally,
    while the unexpectedly larger coercivity of Mo1.5Mn1.5B2 correlates with its greater
    Eₑₓ. These findings enable the development of Mo2FeB2-type multifunctional materials,
    expanding their applications beyond traditional structural material properties.
  description_type: abstract
  lang: und

## Creator

- name: Shola E. Adeniji
  role: author
- name: Alexei A. Belik
  role: author
  orcid: https://orcid.org/0000-0001-9031-2355
  organization: National Institute for Materials Science
- name: Takao Mori
  role: author
  orcid: https://orcid.org/0000-0003-2682-1846
  organization: National Institute for Materials Science
- name: Boniface P. T. Fokwa
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: spin glasses
  schema: not_defined
- subject: anisotropic magnets
  schema: not_defined
- subject: magnetic properties
  schema: not_defined
- subject: Mo2FeB2 type
  schema: not_defined

## Rights

- description: This document is the Accepted Manuscript version of a Published Work
    that appeared in final form in Journal of the American Chemical Society, copyright
    © 2025 American Chemical Society after peer review and technical editing by the
    publisher. To access the final edited and published work see https://doi.org/10.1021/jacs.5c12552.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-10-27
end_date: 2026-10-27

## Journal

- title: Journal of the American Chemical Society
  issn: '00027863'
  volume: '147'
  issue: '44'
  start_page: 40562
  end_page: 40575

## Conference



## Related item



## Funding

- identifier: JPMJMI19A1
  funder_name: JST-Mirai Program
- funder_name: Committee on Research
- funder_name: San Diego Supercomputer Center

## 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: d3f248e1-0ac9-4bcc-8c10-e32746058437
  filename: M1.5Mn1.5B2-spin-glas_for_MDR.pdf
  content_type: application/pdf
  size: 5703153
  md5: 807c706577ab98455b334548bff3359e

## Thumbnail

fileset_id: d3f248e1-0ac9-4bcc-8c10-e32746058437
filename: M1.5Mn1.5B2-spin-glas_for_MDR.pdf