Abstract
Abstract Single phase Mn 0.66 Fe 1.29 P 1- x Si x (0 ≤ x ≤ 0.42) compounds were synthesized using the melt-spinning (rapid solidification) technique. All the compounds form in the Fe 2 P-type hexagonal structure, except a Co 2 P-type orthorhombic structure of the Si-free Mn 0.66 Fe 1.29 P compound. The compounds with 0.24 ≤ x ≤ 0.42 present a FM-PM phase transition, while the compounds with lower Si content show an AFM-PM phase transition. In the Mn 0.66 Fe 1.29 P 1- x Si x compounds, T C and Δ T hys are not only Si content dependent, but also magnetic field dependent. By increasing the Si content from x = 0.24 to 0.42, T C increases from 195 to 451 K and Δ T hys is strongly reduced from ∼61 to ∼1 K. T C increases and Δ T hys decreases with increasing magnetic field, Δ T C /Δ B is about 4.4 K/T. Mn 0.66 Fe 1.29 P 1- x Si x compounds show large saturation magnetic moments with values up to 4.57 μ B /f.u.. A large MCE with a small thermal hysteresis is obtained simultaneously in Fe-rich Mn 0.66 Fe 1.29 P 1- x Si x melt-spun ribbons.
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