The magnetocrystalline anisotropy of MnAl and MnAlC alloys, in the range of existence of the ferromagnetic r phase, has been studied by using the singular point detection technique. The anisotropy field value at 293 K varies from 39 kOe for low manganese and high carbon content to 55 kOe for high manganese and carbon-free samples. The anisotropy of the MnAI r phase is wen described by using only the KI anisotropy constant. The temperature dependence of the calculated anisotropy constant indicates that a single ion mechanism is the origin of the magnetocrystaUine anisotropy in these alloys.

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