Magnetic phase temperature-pressure diagram of FeRh alloy with Fe$_{94}$Rh$_6$ phase

The $T$–$P$ magnetic phase diagram of the Fe$_{50}$Rh$_{50}$ alloy with the Fe$_{94}$Rh$_6$ iron-rich phase has been studied based on the resistivity measurements under hydrostatic pressure. The Neel temperature $T_N\approx$ 370 K up to pressures of 2 GPa shows a regular displacement with a positive pressure coefficient of +42.3 K/GPa. The effect of the Fe$_{94}$Rh$_6$ phase on the $T_N$ is revealed at high pressures ($P>$ 3.5 GPa), at which the triple point region on the phase diagram is rounded due to the possible formation of a new high-pressure antiferromagnetic structure.