Anisotropy of the magnetocaloric effect in DyNiAl

We present study of the anisotropic magnetocaloric effect in DyNiAl. This compound crystallizes in the hexagonal ZrNiAl-type structure, orders magnetically below TC=31K and undergoes a further magnetic phase transition at T1=15K. The Dy-moments are aligned ferromagnetically along the hexagonal cc-axis below TCTC, the additional antiferromagnetic component develops within the basal plane below T1T1. The magnetocaloric effect was evaluated from the magnetization measurements with field applied along the cc-axis and perpendicular to it. Our data reveal a strong anisotropy of the magnetocaloric effect. The large effect occurs for field applied along the cc-axis whereas the entropy change is small for the perpendicular field direction.