Abstract
We present here the magneto thermal properties, damping behavior and effect of Cerium doping on ferromagnetic insulator Yttrium Iron Garnet (YIG), synthesized via solid state method and Spark Plasma Sintering. The thermal conductivity was measured using Laser Flash technique in the temperature range of 300–1000° K. A decrease in thermal conductivity was observed up to the Curie temperature of YIG, beyond which it showed a constant behavior. On Ce doping of YIG, 15% enhancement of thermal conductivity was achieved, besides leading to an increase of magnetic moment at all temperatures. This gain is attributed to the increase of grain size and replacement of diamagnetic Y3+ ions in YIG by paramagnetic Ce3+ ions in Ce doped YIG. The spark plasma sintered YIG showed a decrease in particle size and grain size resulting in decrease of both thermal conductivity and saturation magnetization. The damping parameters obtained from ferromagnetic resonance measurement revealed a very low magnetic damping even on Ce doping. The work provides effective information regarding the enhancement of spin dynamic properties of YIG suitable for spin-caloritronic applications.
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