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The anomalous Nernst effect in a perpendicularly magnetized Ir$_{22}$Mn$_{78}$/Co$_{20}$Fe$_{60}$B$_{20}$/MgO thin film is measured using well defined in-plane temperature gradients. The anomalous Nernst coefficient reaches 1.8 $\mu$V/K at room temperature, which is almost 50 times larger than that of a Ta/Co$_{20}$Fe$_{60}$B$_{20}$/MgO thin film with perpendicular magnetic anisotropy. The anomalous Nernst and anomalous Hall results in different sample structures revealing that the large anomalous Nernst coefficient of the Ir$_{22}$Mn$_{78}$/Co$_{20}$Fe$_{60}$B$_{20}$/MgO thin film is related to the interface between CoFeB and IrMn. Moreover, a possible application of anomalous Nernst effect that takes advantage of the perpendicular magnetization to obtain large voltage, owing to the in-plane geometry of the device has been proposed.
