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In their Comment, Kimling and Kuschel (hereafter the commenters) challengeour original interpretation of the magneto-optical Kerr effect (MOKE)measurements using ultrasensitive Sagnac interferometer, claiming that thetransverse spin-Seebeck effect (TSSE) is not the only contribution to themeasured change in the Kerr rotation angle from a Ni80Fe20 (NiFe) ferromagnetic(FM) slab subjected to a lateral temperature gradient in the presence of amagnetic field. The authors assert that: (1) the TSSE, in general, has not beencompletely proven so far, and that the existing theories, in particular thephonon magnon drag model that we have used in our publication, in fact cannotexplain the original work of Uchida et al. (2) The commenters based theircritique on an estimate of the magnitude of the measured effect, arguing thatto observe the TSSE that we originally claimed, the temperature gradient in ourmeasurements should have been much larger than the value we measured. In thisReply, firstly, we summarize previous literature reports on the TSSE responsein FM metallic systems. Secondly, we dispute the estimate of the necessarylarge temperature gradient made by the commenters. Importantly, the Kerr effectsensitivity to spin accumulation (via the TSSE response) has not beenrecognized by the commenters, in fact it was mistakenly assumed that the Kerreffect sensitivity to the spin accumulation by the TSSE is the same as the Kerrsensitivity to the bulk magnetization change due to the temperature change. Inconclusion, we show that the TSSE is the only viable interpretation of ouroriginal measurements, and that the phonon-magnon drag model is indeed capableof explaining our results.

Reply to Comment on Optical detection of transverse spin-Seebeck effect in permalloy film using Sagnac interferometer microscopy (arXiv:1810.13220)