Magnetic domain structure and spin reorientation process

Abstract The domain structure was investigated in the spin reorientation region on the (100) and (001) planes of Nd 2 Fe 14 B and R(Fe, Co) 11 Ti (R = Tb, Dy) single crystals by means of the magnetooptical Kerr effect. The magnetic phase diagram of a tetragonal magnetic crystal was theoretically calculated and the effect of domain structures on phase transitions is investigated. On the basis of the observed domain configurations and domain wall density calculations, possible models for the volume magnetization distributions in tetragonal magnetic crystals with “easy cone” and “easy plane” anisotropy have been discussed.