We investigate theoretically field-induced switching of magnetic topology in a nanodisk-shaped sample of noncentrosymmetric dipolar magnet in which the Dzyaloshinskii-Moriya interaction that stabilizes an antiskyrmion with $N_{\mathrm{sk}}=+1$ and the magnetic dipole interaction that stabilizes a skyrmion with $N_{\mathrm{sk}}=-1$ are in keen competition, where $N_{\mathrm{sk}}$ is the skyrmion number. Our micromagnetic simulations demonstrate that the competition offers a unique opportunity to switch magnetic textures with distinct magnetic topology among the antiskyrmion $(N_{\mathrm{sk}}=+1)$, elliptical skyrmion $(N_{\mathrm{sk}}=-1)$, and nontopological bubble $(N_{\mathrm{sk}}=0)$ in a deterministic manner by application of magnetic fields parallel to the sample plane. By calculating time and spatial profiles of energy contributions from respective interactions and magnetic anisotropy, we clarify the physical mechanism and properties of the observed field-induced topology switching phenomena. Our findings are expected to provide useful insights in the spintronic application of topological magnetism.

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• Magnetic interactions
• Magnetic order
• Magnetic phase transitions
• Magnetic texture
• Magnetism
• Magnetization dynamics
• Spin dynamics
• Spintronics
• 2-dimensional systems
• Landau-Lifschitz-Gilbert equation
• Micromagnetic modeling