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UPtAl is a ferromagnet with the Curie temperature 43.5 K, the rectangular hysteresis loop and the coercive force H c =0.7 T at 1.7 K. Due to the strong magnetocrystalline anisotropy, the hysteresis properties are likely caused by the intrinsic coercitivity of narrow domain walls. The magnetic viscosity in UPtAl has been studied by magnetization measurements. In a field slightly lower than...