Magnetic properties of Heusler alloys Ru_2−xFe_xCrSi

Abstract

We report on the structural and magnetic properties of newly synthesized Heusler alloys, Ru_2-xFe_xCrSi, which have quite recently been shown to be candidates for ferromagnetic metals with high spin polarization from band structure calculations. Polycrystalline samples of Heusler alloys Ru_2-xFe_xCrSi were prepared for 0.5≤x≤1.8. They were found to have L2₁ structures for 0.5≤x≤1.5 and B2 for x = 1.8. Magnetic measurements showed that they are ferromagnets. The Curie temperature for x = 1.0 was found to be 370 K. The Curie temperature tends to increase with increasing Fe concentration x. The saturation magnetic moment increases almost linearly as x increases. For higher Fe concentration the saturation magnetic moment is close to 2 μ_B per formula unit, which is theoretically expected.