Abstract
The effect of absorbed hydrogen on the magnetic property of invar alloys, Fe-35 at.% Ni and Fe-31 at.% Ni-3 at.% Mn, was studied by means of Fe 57 Mössbauer effect. Electrolytic hydrogenation changed weak ferromagnetic component into ferromagnetic, and the change was found to be accompanied with the change of structure into hydride by a large fraction. The variation of the magnetic interaction by the introduction of interstitial hydrogen atoms was discussed from the effect of lattice expansion and the change in the electronic state around the hydrogen atoms.
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