Ferromagnetic shape memory alloys has became the popular objects of researches from the moment of finding out a plastic deformation caused by magnetic field in the alloys of Ni-Mn-Ga. The study of deformations induced by field was conducted also and in Fe based alloys, such as Fe-Pd, Fe-Pt and Fe-Ni-Co-Ti. Such factors as fragility of high temperature phase, comparatively low saturated magnetization and low Curie temperature hinder to the wide practical application of Ni-Mn-Ga alloys capable of to generate considerable deformations induced by magnetic field. The alloys of the system of Fe-Co-Ni-Ti excel Ni-Mn-Ga in the parameters indicated higher and in principle can be examined as an alternative material to be used as the actuators. An addition of Cu is a way to lower the elastic module of an austenite phase to decrease an elastic energy of the growing coherent martensite crystals that gives rise as a result the hysteresis narrowing. Measured temperature dependences of magnetizations of Fe-Co-Ni-Ti ferromagnetic alloys doped by Cu have shown that martensite magnetizations of the considered alloys are more than three times larger in comparison with Ni-Mn-Ga alloy at the field of 10 kOe.

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1. The martensite structure and the characteristics of thermoelastic martensitic transformation in Fe-Co based ferromagnetic alloys