Regularities and Features in the Behavior of Electrical and Magnetic Properties of Co₂FeZ (Z = Al, Si, Ga, Ge, Sn, Sb) Half-Metallic Ferromagnetic Heusler Alloys

The electrical resistivity, magnetization, and Hall effect in Co₂FeZ (Z = Al, Si, Ga, Ge, Sn, Sb) ferromagnetic Heusler alloys have been investigated. It has been demonstrated that there are a number of correlations between the electronic and magnetic characteristics of the alloys under study, which are manifested by changes in the atomic number of the Z component. For Co₂FeAl and Co₂FeSi alloys, which are HMFs, the magnetization value agrees with the Slater–Pauling rule. The electrical resistivity of Co₂FeAl, Co₂FeSi, and Co₂FeGe compounds exhibits quadratic temperature dependence at temperatures below 30 K and above 65 K. In the range of intermediate temperatures (40 to 65 K), a power-law dependence of ~T^b with an exponent of 3.5 ≤ b ≤ 4 has been revealed, which may be attributed to two-magnon scattering processes.