FeRh Phase Diagram

The project aims to reveal and understand magnetic H-T-phase diagram of FeRh in fields up to 17 T and temperatures down to 3 K. In particular: (a) phase transition from antiferromagnetic to ferromagnetic phase and verify the existence of critical point; (b) phase transition from antiferromagnetic collinear to antiferromagnetic non-collinear phase and reveal if there is a triple point, at which these three phases co-exist. Although the magnetic order is defined and fully dominated by the spins of Fe, it is expected that the magnetic state of Rh plays in all these phase transitions the decisive role. Hence we propose XMCD experiments aiming to detect magnetic moments of both Fe and Rh. Revealing a phase diagram can significantly improve our understanding of the magnetic phase transitions. Moreover, the ways of the emergence of ferromagnetism by heating in the special case of FeRh strongly influences the development of magnetic data storage devices.