  The observation of quantized anomalous Hall conductance in the forced
ferromagnetic state of MnBi2Te4 thin flakes has attracted much attentions.
However, strong magnetic field is needed to fully polarize the magnetic moments
due to the large antiferromagnetic interlayer exchange coupling. Here, we
reported the magnetic and electrical transport properties of the magnetic van
der Waals MnBi2Te4(Bi2Te3)n (n=1,2) single crystals, in which the interlayer
antiferromagnetic exchange coupling is greatly suppressed with the increase of
the separation layers Bi2Te3. MnBi4Te7 and MnBi6Te10 show weak
antiferromagnetic transition at 12.3 and 10.5 K, respectively. The
ferromagnetic hysteresis was observed at low temperature for both of the
crystals, which is quite crucial for realizing the quantum anomalous Hall
effect without external magnetic field. Our work indicates that
MnBi2Te4(Bi2Te3)n (n=1,2) provide ideal platforms to investigate the rich
topological phases with going to their 2D limits.
