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Magnetic and electrical properties of the half-metallic ferromagnets Co2CrAl
Authors:N. I. Kourov  A. V. Korolev  V. V. Marchenkov  A. V. Lukoyanov  K. A. Belozerova
Affiliation:1613. Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990, Russia
2613. Ural Federal University named after the First President of Russia B. N. Yeltsin (on the basis of Ural State Technical University-UPI), ul. Mira 19, Yekaterinburg, 620002, Russia
Abstract:This paper presents the results of measurements of the magnetic and electrical properties of the ferromagnetic alloy Co2CrAl in two structural states: (i) after severe plastic deformation and (ii) after shortterm high-temperature annealing of the deformed specimens. The experiments have been performed at temperatures in the range from 2 to 900 K in magnetic fields H ≤ 50 kOe. The ferromagnetic Curie temperature T C and the paramagnetic Curie temperature Θ have been determined (T C = 305 K and Θ = 326 K), as well as the spontaneous magnetic moment μ S and the effective magnetic moment μeff per molecule of the alloy (μ S = 1.62 μB and μ eff 2 = 8.2 μ B 2 ). It has been shown that the magnetic crystalline anisotropy energy of the alloy is on the order of ~5 × 105 erg/g. The specific features of the electrical properties are associated with the presence of an energy gap in the electronic spectrum near the Fermi level E F and with the change in the parameters of the energy gap as a function of the temperature.
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