1 Effect of the addition CeO2 on the growth of YIG single crystal fibers using

Cerium-substituted yttrium iron garnet (Ce:YIG) exhibits the greatly large Faraday Effect, thus it has been widely studied. With a LHPG method, however, it is hard to grow pure yttrium iron garnet (YIG) single crystal fibers due to oscillatory instability of the melt and constitutional supercooling effect. From the experimental observation, the addition of CeO2 into YIG fiber would increase the periodic oscillation of the melt ascribed to Ce-doping, the experimental segregation coefficient less than the unit, would decrease the melting point and the molten zone became wider, which resulted in a decrease of the temperature gradient. An increase of the laser power input could be used to introduce a steeper temperature gradient, and then the Ce-substitution YIG single crystal fibers could be grown at the faster pulling rate. But it was well considered that constitutional supercooling effect and flow oscillation in the melt would also influence the quality of the grown fibers. Moreover, the solubility limit of cerium ions in Ce-substituted Ce:YIG single crystal fiber, which was grew in an ordinary atmosphere, was found to be approximately 0.3. When the amount of CeO2 added was over x = 0.3, the inclusion of the CeO2 phase was residual in the core region of the grown Ce:YIG crystal fibers. *Corresponding Autho