First-Order Magnetic Phase Transition in bcc FeRh–Ir Alloy under High Pressures up to 6.2 GPa

Magnetic phase transitions in bcc FeRh 0.95 Ir 0.05 alloy were investigated under high pressures up to 6.2 GPa by means of X-ray diffractometry using synchrotron radiation. The phase transition from antiferromagnetic to paramagnetic at high pressures with increasing temperature was confirmed to be a first-order phase transition accompanied by a volume expansion of about 0.3%. The mechanism of the first-order magnetic transition was interpreted in terms of spin fluctuation and magneto-volume effect.