A large magnetic-field-induced strain in Ni-Fe-Mn-Ga-Co ferromagnetic shape memory alloy

► A large strain of Ni-Fe-Mn-Ga-Co ferromagnetic shape memory alloys. ► The magnetocrystalline anisotropy constant Ku was increased by the addition of Mn. ► The Ni49.5Fe14.5Mn4.0Ga26.0Co6.0 alloy provides a MFIS of about 11.3% at R.T.