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

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.

arXiv comment17 pages, 4 figures

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• First-principles study of magnon-phonon interactions in gadolinium iron garnet
• Magnon polarons in the spin Peltier effect
• Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect
• Double accumulation and anisotropic transport of magneto-elastic bosons in yttrium iron garnet films
• Magnon Polarons induced by a magnetic field gradient
• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films
• Facet-dependent magnon-polarons in epitaxial ferrimagnetic Fe3O4 thin films
• Strain-Tunable Magnetic Compensation Temperature of Epitaxial Tb${}_3$Fe${}_5$O${}_{12}$ Thin Films
• Unconventional magnetism mediated by spin-phonon-photon coupling
• Accumulation of magnetoelastic bosons in yttrium iron garnet: kinetic theory and wave vector resolved Brillouin light scattering
• Observation of quantum interference conductance fluctuations in metal rings with strong spin-orbit coupling
• Spin Seebeck in the weak exchange coupled van der Waals antiferromagnet