Topological energy barrier for skyrmion lattice formation in MnSi

Abstract

We report the direct measurement of the topological skyrmion energy barrier through a hysteresis of the skyrmion lattice in the chiral magnet MnSi. Measurements were made using small-angle neutron scattering with a custom-built resistive coil to allow for high-precision minor hysteresis loops. The experimental data was analyzed using an adapted Preisach model to quantify the energy barrier for skyrmion formation and corroborated by the minimum-energy path analysis based on atomistic spin simulations. We reveal that the skyrmion lattice in MnSi forms from the conical phase progressively in small domains, each of which consisting of hundreds of skyrmions, and with an activation barrier of several eV.

Final accepted version

References in corpus (9)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
• Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
• Spirit: Multifunctional Framework for Atomistic Spin Simulations
• Skyrmion formation in a bulk chiral magnet at zero magnetic field and above room temperature
• Reorientations, relaxations, metastabilities and multidomains of skyrmion lattices
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Measuring the Formation Energy Barrier of Skyrmions in Zinc Substituted Cu${}_2$OSeO${}_3$