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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 $10^{-4}$ 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":"b43105c9fb25102100752bcf78ff028519c9553b67033906439b2ab63dd8276d","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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