Magnon-phonon hybridization in nearly compensated magnets for thermoelecric conversion and heat control

本课题研究了磁绝缘体中自旋-晶格相互作用效应，特别是磁补偿对ga取代钇铁石榴石（Ga-YIG）中自旋-热转换（自旋塞贝克效应：SSE）的影响，随着ga取代的增加，磁补偿增加。通过液相外延优化了高质量Ga-YIG的生长，并通过x射线衍射证实了其结构质量。在较低的磁场下，SSE电压出现峰值，证实了薄膜的补偿较大和磁性质量较高。为了进一步研究磁补偿对磁子-声子杂化的作用及其对自旋-热转换性质的影响，需要对所制备的薄膜进行自旋输运研究。

The project deals with the investigation of spin-lattice interaction effects in magnetic insulators, in particular the effect of magnetic compensation on spin-heat conversion (spin Seebeck effect: SSE) in Ga-substituted yttrium iron garnet (Ga-YIG), with increasing Ga-substitution the magnetic compensation increases.I optimized the growth of high-quality Ga-YIG by liquid phase epitaxy, the structural quality was confirmed by x-ray diffraction. The presence of peaks in the SSE voltage at lower magnetic field than in YIG confirm the larger compensation and high magnetic quality of the films.Further spin transport studies on the grown films are to be performed to investigate the role of magnetic compensation on magnon-phonon hybridization and its effect on the spin-heat conversion properties.