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The combination of piezoelectricity and ferromagnetic (FM) order in atwo-dimensional (2D) material, namely 2D piezoelectric ferromagnetism (PFM),may open up unprecedented opportunities for novel device applications. Here, wepredict an in-plane FM semiconductor Janus monolayer NiClI with considerablylarge magnetic anisotropy energy (MAE) of 1.439 meV, exhibiting dynamic,mechanical and thermal stabilities. The NiClI monolayer possesses largerin-plane piezoelectricity ($d_{11}$$=$5.21 pm/V) comparable to that of$\mathrm{MoS_2}$. Furthermore, NiClI has huge out-of-plane piezoelectricity($d_{31}$$=$1.89 pm/V), which is highly desirable for ultrathin piezoelectricdevice application. It is proved that huge out-of-plane piezoelectricity isrobust against electronic correlation, which confirms reliability of huge$d_{31}$. Finally, being analogous to NiClI, PFM with large out-of-planepiezoelectricity can also be achieved in the Janus monolayers of NiClBr andNiBrI, with the predicted $d_{31}$ of 0.73 pm/V and 1.15 pm/V, respectively.The predicted huge out-of-plane piezoelectric response makes Janus monolayerNiClI a good platform for multifunctional semiconductor spintronicapplications, which is also compatible with the bottom/top gate technologies ofconventional semiconductor nanoelectronic devices.

Huge out-of-plane piezoelectric response in ferromagnetic monolayer NiClI