Polar ${\mathrm{VOSe}}_2{\mathrm{O}}_5$, belonging to the $P4cc$ space group ($C_{4V}$ symmetry), was recently discovered to host a rare Néel-type skyrmion phase within a very narrow range of temperature and magnetic field. Motivated by this discovery, we investigated the effect of pressure on its magnetic properties, focusing on improving the stability of the skyrmion phase. At ambient pressure, two magnetic transitions were observed at $T_{\mathrm{C}1}\sim 7.4\mathrm{K}$ and $T_{\mathrm{C}2}\sim 4.0\mathrm{K}$. Notably, the contrasting behavior of these transitions under applied magnetic fields—$T_{\mathrm{C}1}$ increases, whereas $T_{\mathrm{C}2}$ is suppressed—reflects the magnetic anisotropy in ${\mathrm{VOSe}}_2{\mathrm{O}}_5$. Neutron diffraction refinements revealed a three-up-one-down ferrimagnetic configuration aligned along the $b$ axis at 1.8 K, and an incommensurate cycloidal spin structure rotating within the $bc$ plane at 6 K, further demonstrating the intrinsic magnetic anisotropic in ${\mathrm{VOSe}}_2{\mathrm{O}}_5$. Pressure-dependent ac susceptibility measurements showed $T_{\mathrm{C}1}$ increasing by 0.043(3) K/kbar and $T_{\mathrm{C}2}$ decreasing by −0.052(4) K/kbar, indicating pressure-tunable anisotropy. The field-temperature (H-T) phase diagram confirms the stabilization of the Néel-type skyrmion phase under 14.21 kbar of pressure, with its area expanding approximately threefold. These findings underscore the role of pressure in promoting Néel-type skyrmion stability through modulation of the magnetic anisotropy, offering valuable insights into tuning topological phases for spintronics and related technological applications.

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• Magnetic anisotropy
• Magnetism
• Ferrimagnets
• Magnetic insulators
• Magnetic systems
• Neutron diffraction
• Pressure effects
• Susceptibility measurements