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We report the magnetic and electric properties of Ba$_3$NiNb$_2$O$_9$, whichis a quasi-two-dimensional spin-1 triangular lattice antiferromagnet (TLAF)with trigonal structure. At low $T$ and with increasing magnetic field, thesystem evolves from a 120 degree magnetic ordering phase (A phase) to anup-up-down ($uud$) phase (B phase) with a change of slope at 1/3 of thesaturation magnetization, and then to an "oblique" phase (C phase).Accordingly, the ferroelectricity switches on at each phase boundary withappearance of spontaneous polarization. Therefore, Ba$_3$NiNb$_2$O$_9$ is aunique TLAF exhibiting both $uud$ phase and multiferroicity.

Successive magnetic phase transitions and multiferroicity in Spin-1 triangular lattice antiferromagnet Ba$_3$NiNb$_2$O$_9$