LOCAL MEASUREMENT OF MAGNETIZATION IN 2 GA-YIG SINGLE-CRYSTALS GROWN BY DIFFERENT METHODS

Non-destructive local measurements of the spontaneous magnetization M//s over a small volume ( approximately equals 10** minus **2 mm**3) have been carried out on two Ga-YIG single crystals, prepared under different growth conditions, using the Larmor precession of a neutron beam transmitted through a platelet shaped sample. The first of them was prepared by the classical high temperature solution (HTS) flux method and the second adding the accelerated crucible rotation technique (ACRT), and enhancing the crucible size. The samples were characterized by optical and X-ray topographic means. The main part of the results is confirmed by performing a direct measurement of the magnetization of small cubes cut out from the adjacent slice of the as-grown crystals.