Magnetic and magnetostrictive properties of the ternary Fe67.5Pd30.5Ga2 ferromagnetic shape memory ribbons. (July 2020) - Sofronie, Mihaela
Abstract: Specific functional characteristics of the ferromagnetic shape memory alloy Fe67.5 Pd30.5 Ga2 prepared as ribbons by rapid quenching technique are reported. The shift of the martensitic transformation temperature induced by the applied magnetic field was determined from the thermomagnetic measurements at various fields up to 5T being proved to be in good agreement with the result obtained from calorimetric data via the Clapeyron - Claussius relation. Magnetostriction measurements reveal a pure spin rotation mechanism under low applied magnetic fields, allowed by the reduced magnetic anisotropy. In high magnetic fields and at temperatures close to martensitic transformation, the magnetostriction has a linear increase up to the maximum considered magnetic induction of 3T. This behavior has been discussed in connection with the forced magnetostiction aspects. Highlights: Martensitic transformation of Fe-Pd-Ga rapidly quenched ribbons with columnar structure. Magnetically induced shift of the martensitic transformation temperature. Magnetostriction mechanisms in the vicinity of martensitic transformation for ribbons.