Bubble domains in Y3-2xCa2xFe5-xVxO12

The rare-earth-free iron garnets of the system Y3-2xCa2xFe5-xVxO12have been studied to obtain a new bubble material which has a high domain wall mobility and stable temperature characteristics. The crystals were grown by the flux and LPE methods. It was, however, very difficult to grow large and high quality crystals. The bubble domains were observed both in the flux-grown crystal platelets and in LPE films. The domain wall mobility measured by the collapse method was 170 cm/s/Oe, which is not as high as the value expected. The temperature dependences of domain diameter and the collapse field were small up to about 70°C.