Switching magnetic spin-states using small magnetic fields in compositionally complex Sm(M7)O$_3$
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2026
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| author | Dokala, R. K. Geers, M. Nordblad, P. Clulow, R. Mathieu, R. |
| author_facet | Dokala, R. K. Geers, M. Nordblad, P. Clulow, R. Mathieu, R. |
| contents | High-entropy perovskites (HEPs) offer a unique platform for exploring magnetic phenomena arising from extreme B-site chemical disorder. In Sm(M7)O$_3$, where there are 7 cations in equal amounts at the B-site; M = Ti, Cr, Mn, Fe, Co, Ni, Cu), we observe long-range antiferromagnetic ordering near 105 K accompanied by a small but robust excess magnetic moment intrinsic to the chemically disordered lattice. This uncompensated moment is evident from ZFC-FC irreversibility, shifts in the isothermal M(H) loops, and discrete remanent states identified through direct-current-demagnetization measurements. Remarkably, cooling fields as small as $\pm$ 20 Oe are sufficient to select the direction of the excess moment, and the chosen magnetic state remains stable against applied fields up to 50 kOe. A low-temperature anomaly in the remanent magnetization further reveals a secondary contribution from the Sm$^{3+}$ sublattice, although the primary origin of the excess moment resides in the B-site AFM sublattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_08163 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Switching magnetic spin-states using small magnetic fields in compositionally complex Sm(M7)O$_3$ Dokala, R. K. Geers, M. Nordblad, P. Clulow, R. Mathieu, R. Materials Science High-entropy perovskites (HEPs) offer a unique platform for exploring magnetic phenomena arising from extreme B-site chemical disorder. In Sm(M7)O$_3$, where there are 7 cations in equal amounts at the B-site; M = Ti, Cr, Mn, Fe, Co, Ni, Cu), we observe long-range antiferromagnetic ordering near 105 K accompanied by a small but robust excess magnetic moment intrinsic to the chemically disordered lattice. This uncompensated moment is evident from ZFC-FC irreversibility, shifts in the isothermal M(H) loops, and discrete remanent states identified through direct-current-demagnetization measurements. Remarkably, cooling fields as small as $\pm$ 20 Oe are sufficient to select the direction of the excess moment, and the chosen magnetic state remains stable against applied fields up to 50 kOe. A low-temperature anomaly in the remanent magnetization further reveals a secondary contribution from the Sm$^{3+}$ sublattice, although the primary origin of the excess moment resides in the B-site AFM sublattice. |
| title | Switching magnetic spin-states using small magnetic fields in compositionally complex Sm(M7)O$_3$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.08163 |