Magnetic Structures in the Sc1-xTixFe₂System–Magnetic Phase Transitions in Itinerant Electron Systems

The magnetic structure and magnetic phase transitions of Sc 1- x Ti x Fe 2 with x ≧0.5 were studied from measurements of Mössbauer effect and magnetization. A coexistent state of ferro- and antiferromagnetism appears at low temperatures in samples with x ≧0.7. A magnetic phase transition from the ferromagnetic to the coexistent state is observed with decreasing temperature for 0.7≦ x < 0.8 and that from the antiferromagnetic to the coexistent state for x > 0.8. These transitions can be explained as phase transitions in an itinerant electron system with weakly coupled ferromagnetic and antiferromagnetic components of spin fluctuation modes.