Measurements of the magnetostrictive characteristics of NiMnGa martensitic single crystal have been carried out under low alternating magnetic field in a range of 0 - 20 MHz.A longitudinal magnetostriction appeared to be 2-3 times higher than that for pure polycrystalline Ni and its amplitude increases at high dc magnetic field.

The transverse magnetostriction is found to be dependent on the orientation of the alternate magnetic field and crystallographic directions. This magnetostriction along two long crystallographic axes is essentially higher than that for pure Ni in one-variant state of martensitic single crystal. Its magnitude inreases drastically in two-variant state.

The magnetic-to-electric conversion efficiency in the Ni-Mn-Ga/piezoceramic system was found 0.001-0.01 V/Oe in frequency range of 0 - 20 MHz.

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