Abstract
Melt spun ribbons of Heusler alloys Mn2-2xCo0.5+xV0.5+xGa (x = 0, 0.1, 0.2, 0.25, 0.3, 0.4, 0.5) with 24 valence electrons were synthesized. Curie temperature decreases from 634 to 122 K with decreasing Mn content. Fully compensated ferromagnetic state was achieved for the x = 0.2 and x = 0.4 compositions. The compensation temperature, determined from the Hall resistivity measurements, was found to be ∼130 K for the Mn1.6Co0.7V0.7Ga composition and ∼317.5 K for the Mn1.2Co0.9V0.9Ga composition. Besides, a kink on the magnetization curves of the x = 0–0.4 compounds, observed at T ≈ 70 K, was suggested to be presumably due to a spin-reorientation transition.
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