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

## TL;DR

This study demonstrates room-temperature, low-field resonant enhancement of the spin Seebeck effect in partially compensated magnets through chemical doping, significantly improving the effect's magnitude and operational conditions.

## Contribution

It reports the first observation of phonon-resonant SSE enhancement at room temperature and low magnetic fields in doped ferrites, expanding potential spintronic applications.

## Key findings

- Achieved 700% SSE enhancement in Lu2BiFe4GaO12
- Observed resonance at magnetic fields around 10^-1 T
- Showed chemical doping tunes magnon dispersion

## Abstract

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