Martensitic Magnetostriction Measurements
Ni2MnGa Martensitic Magnetostriction Measurements
The results of the hard axis curves performed at 1.9 and 8.3 MPa applied load allow for a
calculation of the magnetostriction constant for a single variant of martensite. The M-H
curves below show that larger applied loads require larger fields to saturate, which implies
that rotation of the magnetization within the single variant microstructure produces a
contraction in the direction of the applied field, and an extension in the loading direction.
This process is shown schematically in the figure on the right.
Because of the extension in the loading direction due to magnetostriction within the single variant,
any increase in applied load corresponds to an increase in mechanical energy which must be
overcome by additional applied field energy in order to saturate the specimen. By equating these
two energies, the value of the magnetostriction constant can be calculated:
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