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We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on magnetic domain nucleation in a ferromagnetic thin film with perpendicular magnetic anisotropy. We propose an extended droplet model to determine the nucleation field as a function of the in-plane field. The model can explain the experimentally observed nucleation in a Co/Ni microstrip with the interfacial DMI. The results are also reproduced by micromagnetic simulation based on the string model. The electrical measurement method proposed in this study can be widely used to quantitatively determine the DMI energy density. Chiral spin textures, such as a skyrmion and a Néel type magnetic domain wall (DW), which are formed in perpendicularly magnetized ferromagnet (FM)/non-magnet (NM) structures, have attracted considerable attention for future spintronic devices that can perform massive and high-speed data processing with low power consumption [1-7].Lack of structural inversion symmetry with strong spin-orbit coupling at the FM/NM interface results in the Dzyaloshinskii-Moriya interaction (DMI) which results in chirality in spin textures [8][9][10]. In recent years, it has been experimentally demonstrated that skyrmion-like bubble domains can be formed stably at room temperature [11][12] and driven along a magnetic nanowire at a velocity of ~100 m/s [13,14]. In addition, a

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