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 ~Tb with an exponent of 3.5 ≤ b ≤ 4 has been revealed, which may be attributed to two-magnon scattering processes.