Abstract
The effects of partial substitution of Co on magnetocrystalline anisotropy and magnetic-field-induced strain (MFIS) in Ni–Fe–Ga alloys have been investigated. To obtain a single-variant state in the martensite phase, uniaxial compressive stresses were applied to the single-crystalline specimen. The Curie temperature T C is increased up to 405 K by a partial substitution of 6 at% Co. The single-variant martensite phase in the Ni 49Fe 18Ga 27Co 6 alloy exhibits a large value of magnetocrystalline anisotropy constant K = 1.2 × 1 0 6 erg / cm 3 at 300 K. Furthermore, the magnitude of the MFIS is enhanced in a wide range of temperature. Therefore, the increase of T C by the substitution of Co effectively improves the MFIS.
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