Magnetocaloric effect in powder of GdTbDyHoEr high-entropy alloy

The paper presents the results of studying the structural, magnetic and magnetocaloric properties of the powder of GdTbDyHoEr high-entropy alloy obtained by ball milling a rapidly quenched nanocrystalline ribbon of this alloy. When the temperature and external magnetic field change, a magnetic phase transition between a helical antiferromagnet and ferromagnet occurs in the powder. The change in the magnetic entropy $\Delta S_M$ was determined based on the Maxwell relation from the magnetic isotherms data. The maximum value of $\Delta S_M$ is observed at a temperature of 178 K and for a magnetic field change amplitude of 9 T it is 12.1 Jkg$^{-1}$ $\cdot$ K$^{-1}$.