Abstract
Magnetic properties of Ni46Mn24Ga22Co4Cu4, (Ni45Mn23Ga22Co5Cu5, Ni46Mn22.5Ga23Co5Cu3.5) tetragonal martensites with c/a≈1.14 exhibiting near 10% magnetic field-induced strain (MFIS) were investigated between 10 and 500K and up to 9T field. The (001) easy plane magnetocrystalline anisotropy with K1(300K)=−1.95∙105J∙m−3 (K2<6%|K1|, K3<2%|K1|, MS(300K)=63Am2/kg) was about 30% lower than in the non-doped Ni50.5Mn30.4Ga19.1 reference, which can be related to a reduced c/a ratio in the doped material. In spite of different type of magnetocrystalline anisotropy compared to 10M martensite, the mechanism of MFIS is the same, i.e. with the typical first-quadrant magnetization hysteresis and {101} twin boundary motion.
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