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PreprintarXiv licencearXiv

Weak Ferromagnetism in NiS2 under Nanocrystallization

  • Hayato Miyazaki
  • Tomohiko Yoshinaga
  • Ojiro Miyazaki
  • Akira Matsuo
  • Koichi Kindo
  • Hirofumi Ishii
  • Tatsuya Kawae
  • Tetsuya Kida
  • Masashi Nantoh
  • Yoichi Ishiwata
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Abstract

Structurally well-ordered NiS2 nanocrystals with an average diameter of 27.0 ± 6.5 nm retain the bulk-like two-step antiferromagnetic transitions, as shown by magnetization and heat-capacity measurements. Below the lower transition, the nanocrystals exhibit a hysteretic ferromagnetic response with large coercivity, exchange bias, and a vertical loop shift after field cooling, whereas the M-H response just above the transition is nearly linear. These features are best explained by uncompensated surface moments generated where the low-temperature antiferromagnetic order terminates at the nanocrystal surface. The absence of a clear additional bulk-like weak-ferromagnetic component constrains homogeneous-canting models and indirectly favors a domain-wall scenario for the weak ferromagnetism of bulk NiS2.

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Cite

BibTeXRIS
BibTeX
@misc{miyazaki2026weak,
  title = {{Weak Ferromagnetism in NiS$_2$ under Nanocrystallization}},
  author = {Hayato Miyazaki and Tomohiko Yoshinaga and Ojiro Miyazaki and Akira Matsuo and Koichi Kindo and Hirofumi Ishii and Tatsuya Kawae and Tetsuya Kida and Masashi Nantoh and Yoichi Ishiwata},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.00474},
  eprint = {2607.00474},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.00474},
}
RIS
TY  - UNPB
TI  - Weak Ferromagnetism in NiS_2 under Nanocrystallization
AU  - Hayato Miyazaki
AU  - Tomohiko Yoshinaga
AU  - Ojiro Miyazaki
AU  - Akira Matsuo
AU  - Koichi Kindo
AU  - Hirofumi Ishii
AU  - Tatsuya Kawae
AU  - Tetsuya Kida
AU  - Masashi Nantoh
AU  - Yoichi Ishiwata
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2607.00474
UR  - https://arxiv.org/abs/2607.00474
AB  - Structurally well-ordered NiS_2 nanocrystals with an average diameter of 27.0 ± 6.5 nm retain the bulk-like two-step antiferromagnetic transitions, as shown by magnetization and heat-capacity measurements. Below the lower transition, the nanocrystals exhibit a hysteretic ferromagnetic response with large coercivity, exchange bias, and a vertical loop shift after field cooling, whereas the M-H response just above the transition is nearly linear. These features are best explained by uncompensated surface moments generated where the low-temperature antiferromagnetic order terminates at the nanocrystal surface. The absence of a clear additional bulk-like weak-ferromagnetic component constrains homogeneous-canting models and indirectly favors a domain-wall scenario for the weak ferromagnetism of bulk NiS_2.
ER  -