Abstract
The intrinsic magnetic material parameters of the FeAlC magnet are determined in the temperature range from 4.2 to 1100 K. It is shown that magnetization in this alloy is well described by the spin wave theory for temperatures 4.2 to 520 K. For temperatures between 520 and 720 K a narrow plateau in the magnetization plot is present. Similar temperature dependences of the coercive force Hc, the anisotropy field Ha, and the anisotropy constant K1 are observed. The analysis of the temperature dependence of the coercive field leads to the conclusion that the pinning model is valid for the temperature range 4.2 to 520 K. The temperature dependences of the domain wall energy γ, the domain wall width δB, and the critical diameter of single domain particles Dc are determined. Moreover, the distribution of grain orientations is determined and it is shown that the experimentally determined torque curve for the FeAlC magnet is a superposition of the torque originating from the magnetocrystalline anisotropy of K-carbide and α-ferrite.
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