We experimentally investigate the magnetization angle dependence $M\left(\alpha \right)$ for single crys tals of MnTe altermagnetic candidate. In high magnetic fields, experimental $M\left(\alpha \right)$ curves mostly reflect standard antiferromagnetic spin-flop processes, which are allowed below the Néel vector reorientation field. In low magnetic fields and at low temperatures, spontaneous magnetization appears as a sharp $M\left(T\right)$ magnetization jump around 81 K. In this regime, $M\left(\alpha \right)$ dependence is quite unusual: the easy magnetization axis is $\pi /2$ rotated either by increasing the field above 1 kOe or the temperature above 81 K. The observed behavior cannot be expected for antiferromagnetics, e.g., it differs strongly from the well-known weak ferromagnetism. Thus, it requires to take into account the formation of the altermagnetic ground state for MnTe altermagnetic candidate. Despite MnTe is expected to have $g$-wave order parameter, $M\left(\alpha \right)$ magnetization symmetry confirms the prevailing population of one from three easy axes, as it has been shown previously by temperature-dependent angle-resolved photo-emission spectroscopy.

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• Altermagnetism
• Magnetic anisotropy
• Magnetic order
• Spin-orbit coupling
• Altermagnets
• Magnetic semiconductors
• Magnetization measurements