Magnetostriction of Fe₈₁Ga₁₉ oriented crystals

The effect of the orientation on the magnetostriction in Fe₈₁Ga₁₉ alloy has been investigated experimentally and theoretically. The Fe₈₁Ga₁₉ 001 and 110 oriented crystals were prepared and the magnetostriction was measured under different pre-stress. The saturation magnetostriction of the 001 oriented crystal increases from 170×10^-6 to 330×10^-6 under the pre-stress from 0 to 50 MPa. The 110 oriented crystal has a saturation magnetostriction from 20×10^-6 to 140×10^-6 with the compressive pre-stress from 0 to 40 MPa. The magnetostriction of 001 and 110 oriented crystals has been simulated based on the phenomenological theory. The domain rotation path has been determined and the resultant magnetostriction calculated under different pre-stress. The experimental and simulated results both show that the 001 oriented crystal exhibits better magnetostriction than 110 oriented crystal. The enhancement of the saturation magnetostriction by the compressive pre-stress in the 110 oriented crystal is higher than that in the 001 oriented crystal.