20.500.12556/DiRROS-28583 Antiferromagnetic Barkhausen noise induced by weak random-field disorder This study numerically investigates magnetization reversal processes driven by an external magnetic field in three-dimensional antiferromagnetic spin models with weak random-field disorder. Considering an extremely weak disorder and low temperature, we observe a stepwise hysteresis loop and the appearance of short magnetization bursts of a characteristic triangular shape; the number of bursts increases with disorder, indicative of Barkhausen-type noise. These phenomena are attributed to the simultaneous reversal at a given external field of segments composed of spins with identical neighborhoods. A local random field orients one or more spin neighbors, resulting in small, ferromagneticlike clusters distributed throughout the system. As disorder increases, these clusters may merge to form a labyrinthine structure within the antiferromagnetic background, facilitating brief avalanche propagation. The results demonstrate that, compared with familiar random-field ferromagnets, the observed antiferromagnetic Barkhausen noise and the related avalanche sequence have a profoundly different structure, organized into peaks associated with the transition between magnetization plateaus. They exhibit prominent cyclical trends and disorder-dependent multifractal fluctuations, with the singularity spectrum quantifying the degree of disorder. The activity avalanches exhibit scale invariance resembling that recently found in experiments with disordered ferr�⁢magnets and martensites, as well as in quantum Barkhausen noise, which are associated with active geometric regions rather than individual-spin dynamics. The observed scaling behavior is interpreted in terms of self-organized critical dynamics. antiferromagnets magnetization dynamics numerical techniques spin lattice models Barkhausen noise antiferomagneti numerične tehnike true false true American Physical Society ZDA Angleški jezik Slovenski jezik ©2026 The authors Neznano 2026-03-24 14:21:47 2026-03-24 14:21:47 2026-03-27 03:47:41 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 24. 3. 2026; str. 104201-1-104201-11 iss. 10, [article no.] 104201 Vol. 113 Mar. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-11-18 2026-02-18 2026-03-09 537 2469-9969 10.1103/ym7r-kzdl 272853507 https://journals.aps.org/prb/abstract/10.1103/ym7r-kzdl 1 6a35a808-2784-11f1-aa40-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42435 RAZ_Tadic_Bosiljka_2026.pdf RAZ_Tadic_Bosiljka_2026.pdf 1 5526BB331DDCD9119C89487ED22E52E1 c2a1099e8547e99a33c7e895d670db59e119578f0da5ced0e5f5f0e799cad5fa bb1dabde-2784-11f1-aa40-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42436 Institut Jožef Stefan 0 0 0