{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"aa4e196c07e82c9bc27c634d160403fd8adc12d5ce2142dac33fc782fca73d0e","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"0cf678f388eed947d67a2594d59277cc486f61d4b700229de5efa006538ea7b1","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":"1","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 Dy2Ti2O7 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":null,"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 Dy2Ti2O7","topic_ref":"52cddd9c3d75748e46e41f34a20edd20c81c928cc0056fa7e4de59ade0220e82"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4b3115fc3599f2acb2e5295055457d3174441aeac38896cfbc69a69cc8b57a74","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3d21cdf0116238d74b647c695091e1d88687f1e6426b6b56eb8a131b74d2daa4","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"itqXdLp7yJGnMyNsFpjdom0HwOuCbylsFE1etccAmQAmuWn6jaVv-ox8TplKYMBhkKgiV82AOWgbjKjBSKPOBw"},"schema":"pubphys.envelope/1"},"record_hash":"4b3115fc3599f2acb2e5295055457d3174441aeac38896cfbc69a69cc8b57a74","leaf_index":1171}