Phase diagram, ferromagnetic martensitic transformation and magnetoresponsive properties of Fe-doped MnCoGe alloys

► Isostructural alloying can manipulate structural stability of Fe-doped MnCoGe alloys. ► A magnetostructural transition was realized in a temperature window between TCA and TCM. ► The remarkable magnetoresponsive properties in Fe-doped MnCoGe alloys were found. ► A structural and magnetic phase diagram of Fe-doped MnCoGe alloys was proposed.