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Magnetic topological materials have attracted much attention due to thecorrelation between topology and magnetism. Recent studies suggest thatEuCd$_2$As$_2$ is an antiferromagnetic topological material. Here by carryingout thorough magnetic, electrical and thermodynamic property measurements, wediscover a long time relaxation of the magnetic susceptibility inEuCd$_2$As$_2$. The (001) in-plane magnetic susceptibility at 5 K is found tocontinuously increase up to $\sim$10% over the time of $\sim$14 hours. Themagnetic relaxation is anisotropic and strongly depends on the temperature andthe applied magnetic field. These results will stimulate further theoreticaland experimental studies to understand the origin of the relaxation process andits effect on the electronic structure and physical properties of the magnetictopological materials.

Long-Time Magnetic Relaxation in Antiferromagnetic Topological Material EuCd$_2$As$_2$