Pressure effects on magnetic phase transitions in FeRh and FeRhIr alloys

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Abstract
The effect of quasi‐hydrostatic pressures up to 100 kbar is investigated on the phase transitions of Fe1−xRhx alloys by resistivity measurements. The pressure dependence of the first order antiferromagnetic (AF) to ferromagnetic (FM) phase transformation temperature dTk/dp = 4.4 to 5 K/kbar. The pressure dependence of the second order FM to paramagnetic (PM) transition, i.e. that of the Curie‐point is dTC/dp = −0.7 K/kbar. At about 60 kbar the thermal hysteresis diminishes, and above the range of the co‐existence of three phases (AF—FM—PM) the pressure dependence of the AF—PM transition is characterized by dT/dp = 0.6 to 1.0 K/kbar. The AF—PM transition is investigated in an Ir‐substituted alloy (Fe44Rh49.5Ir6.5) also, where dT/dp = 0.6 K/kbar.