Calculation of magnetization curves for orthorhombic magnets based on the néel theory of magnetic phases

A theoretical consideration of the processes of magnetization of orthorhombic crystals has been performed based on the Néel theory of magnetic phases. It has been established that orthorhombic magnets are characterized by linear magnetization curves. The main mechanisms of achieving the state of magnetic saturation of orthorhombic magnets along various directions of magnetization have been considered. A comparison of the theoretical and experimental magnetization curves for single crystals of the orthorhombic compound FeB has been performed. A good coincidence of the theoretical and experimental curves made it possible to determine the saturation field for FeB single crystals in different crystallographic directions and the magnitudes of the constants of magnetocrystalline anisotropy of the FeB compound.