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Resonant enhancement of spin Seebeck effect (SSE) due to phonons was recentlydiscovered in Y3Fe5O12 (YIG). This effect is explained by hybridization betweenthe magnon and phonon dispersions. However, this effect was observed at lowtemperatures and high magnetic fields, limiting the scope for applications.Here we report observation of phonon-resonant enhancement of SSE at roomtemperature and low magnetic field. We observed in Lu2BiFe4GaO12 andenhancement 700 % greater than that in a YIG film and at very low magneticfields around 10-1 T, almost one order of magnitude lower than that of YIG. Theresult can be explained by the change in the magnon dispersion induced bymagnetic compensation due to the presence of non-magnetic ion substitutions.Our study provides a way to tune the magnon response in a crystal by chemicaldoping with potential applications for spintronic devices.

Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets