{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"46f7d1c75e5788254cbb612a829bba69a5f802b3359716c36742ca4a9420a474","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"e9656dc6616fbcb6e962953483a4c5dc4416c7e980c1c8b07c9333ee5e5f2cba","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.ultrafast-spintronics.spin-seebeck-origin","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"A temperature difference across a magnetic insulator like yttrium iron garnet drives a spin current into an attached platinum strip, where it appears as a voltage. Which spin waves carry this current, and how lattice vibrations help, is not settled.","posed_since":"2008","precise":"In YIG/Pt the longitudinal spin Seebeck voltage depends on YIG thickness (saturating over lengths of order 1e-4 cm), magnetic field (suppressed at high field), and temperature, with anomalies where magnons and phonons hybridize (magnon polarons, 2016). Determine the roles of bulk thermal-magnon accumulation, the interfacial magnon-electron temperature difference, and magnon-phonon coupling, and predict the voltage versus thickness, T and field. An answer is one quantitative model reproducing all three dependences.","problem_ref":null,"references":"","settled_by":"A parameter-free model using measured magnon and phonon spectra that reproduces the thickness, field and temperature dependence of the voltage in YIG/Pt.","status_note":"Bulk magnon accumulation models describe the thickness dependence and magnon-polaron anomalies show phonons matter; a unified quantitative account is lacking.","title":"Microscopic origin of the spin Seebeck 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