ORIENTED SINGLE CRYSTAL GROWTH AND MAGNETOSTRICTION OF Fe_(81)Ga_(19)ALLOYS

The Fe_(81)Ga_(19) single crystals were grown in a floating zone melting furnace at a growth rate of 4 mm/h by using a seed crystal.A single crystal was grown by using the seed crystal oriented 5°from the 001 orientation.Pole figure tests were taken at different parts of the single crystal and showed that the start and end parts' axial orientations were 5°and 4°from the 001 orientation,respectively.Another single crystal was grown by using the seed crystal oriented 001 orientation.Magnetostrictive properties along the axis of the crystalsλ_// were measured for the single crystal,and the saturated magnetostrictionλ_// up to 0.0324%was achieved under the pre-stress of 60 MPa.Initial magnetization curves were measured in single crystals along 100,110 and 111 axis,respectively.From the magnetization curves,magnetocrystalline anisotropy constants of Fe_(81)Ga_(19) alloys were calculated,and the values of K_1 and K_2 were 1.3×10~4 and—2.6×10~4 J/m~3,respectively.