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

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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.

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作者简介

Yu. Perevozchikova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: yu.perevozchikova@imp.uran.ru
俄罗斯联邦, Ekaterinburg

V. Irkhin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: yu.perevozchikova@imp.uran.ru
俄罗斯联邦, Ekaterinburg

A. Semiannikova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: yu.perevozchikova@imp.uran.ru
俄罗斯联邦, Ekaterinburg

V. Marchenkov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: march@imp.uran.ru
俄罗斯联邦, Ekaterinburg

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2. Fig. 1. Schematic representation of the density of states of a semi-metallic ferromagnet. The arrows indicate the spin directions for the electron states, the dotted line indicates the Fermi level EF.

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3. Fig. 2. Temperature dependences of specific electrical resistance of Co2FeZ alloys (Z = Al, Si, Ga, Ge, Sn, Sb).

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4. Fig. 3. Dependences of the electrical resistance of Co2FeZ alloys (Z = Al, Si, Ga, Ge, Sn, Sb) on the square of the temperature in the range from 4.2 K to 75 K.

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5. Fig. 4. Dependences of the logarithm log(ρ–ρ0–aT2) on the logarithm of temperature log(T) for Co2FeAl, Co2FeSi and Co2FeGe in the temperature range from 40 K to 65 K.

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6. Fig. 5. Field dependences of magnetization of the studied alloys at T = 4.2 K.

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7. Fig. 6. Field dependences of the Hall resistance of the studied alloys at T = 4.2 K.

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8. Fig. 7. Dependence of the coefficient of the anomalous Hall effect RS on the square of the residual electrical resistance ρ02.

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9. Fig. 8. Dependences of (a) residual electrical resistance ρ0, (b) inverse product of concentration and mobility 1/(n μ), coefficients of (c) anomalous RS and (d) normal R0 Hall effect, (d) saturation magnetization MS on the atomic number of the element Z.

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