| Title: | Antiferromagnetic Barkhausen noise induced by weak random-field disorder |
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| Authors: | ID Tadić, Bosiljka, Institut "Jožef Stefan" (Author) |
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| Files: |  URL - Source URL, visit https://journals.aps.org/prb/abstract/10.1103/ym7r-kzdl
 PDF - Presentation file, download (1,56 MB)
MD5: 5526BB331DDCD9119C89487ED22E52E1
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | 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. |
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| Keywords: | antiferromagnets, magnetization dynamics, numerical techniques, spin lattice models, Barkhausen noise |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 18.11.2025 |
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| Article acceptance date: | 18.02.2026 |
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| Publication date: | 09.03.2026 |
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| Publisher: | American Physical Society |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 104201-1-104201-11 |
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| Numbering: | Vol. 113, iss. 10, [article no.] 104201 |
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| Source: | ZDA |
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| PID: | 20.500.12556/DiRROS-28583  |
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| UDC: | 537 |
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| ISSN on article: | 2469-9969 |
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| DOI: | 10.1103/ym7r-kzdl |
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| COBISS.SI-ID: | 272853507 |
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| Copyright: | ©2026 The authors |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 24. 3. 2026;
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| Publication date in DiRROS: | 24.03.2026 |
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| Views: | 38 |
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| Downloads: | 19 |
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