{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"15a63ec1916b509f3cadbbaa13ac23138dac7c619b1927305840ad9d5ee4a0e1","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4b3115fc3599f2acb2e5295055457d3174441aeac38896cfbc69a69cc8b57a74","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"84cdbee7d2133c11241d7bdd7bcfd801a3ce4126a7f30cb4445dff3d632f9a60","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.spin-ice.monopole-noise","kind":"phenomenon","literature_status":"partially-resolved","n":"2","parents":[],"plain":"Magnetization noise in spin ice, produced by moving monopoles, does not follow a simple random-walk picture. Its spectrum and slow relaxation point to constrained monopole motion, but a full quantitative account is lacking.","posed_since":"2019","precise":"In $\\mathrm{Dy_2Ti_2O_7}$ at $T$ of about 0.5 to 3 K the magnetization-noise spectrum follows $S(\\omega) \\sim \\omega^{-b}$ with $b$ between 1 and 2, and relaxation is faster than Arrhenius would allow at high $T$ and slower at low $T$. Derive $b(T)$ and the relaxation time $\\tau(T)$ from a microscopic dipolar model with monopole hopping, without free parameters beyond the fitted exchange set. An answer is a model reproducing $S(\\omega, T)$ quantitatively.","problem_ref":"4b3115fc3599f2acb2e5295055457d3174441aeac38896cfbc69a69cc8b57a74","references":"","settled_by":"Simulations of the fitted dipolar model with realistic monopole hopping that reproduce measured SQUID noise spectra across temperature.","status_note":"Dusad et al. (Nature 2019) measured the anomalous noise; Hallen et al. (Science 2022) attributed it to monopole motion on an emergent fractal of accessible sites.","title":"Origin of anomalous magnetic noise from monopoles in 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