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Here, we report both ac and dc magnetization, thermodynamic and electricproperties of hexagonal Ba$_3$NiIr$_2$O$_9$. The Ni$^{2+}$ (spin-1) formslayered triangular-lattice and interacts antiferromagnetically while Ir$^{5+}$is believed to act as magnetic link between the layers. This complex magneticinteraction results in magnetic frustration leading to a spin-glass transitionat $T_f$ $\sim$ 8.5 K. The observed magnetic relaxation and aging effect alsoconfirms the nonequilibrium ground state. The system further shows largeexchange bias which is tunable with cooling field. Below the Curie-Weisstemperature $\theta_{CW}$ ($\sim$ -29 K), the magnetic specific heat $C_m$displays a broad hump and at low temperature follows $C_m = \gamma T^\alpha$dependence where both $\gamma$ and $\alpha$ show dependence on temperature andmagnetic field. A sign change in magnetoresistace is observed which is due toan interplay among magnetic moment, field and spin-orbit coupling.

Large exchange bias and low temperature glassy state in frustrated triangular-lattice antiferromagnet Ba$_3$NiIr$_2$O$_9$