Magnetic skyrmions have received much attention as promising, topologically protected quasiparticles with applications in spintronics. Skyrmions are small, swirling topological magnetic excitations with particle-like properties. Nevertheless, the lower stability of magnetic skyrmions only allow them to exist in a narrow temperature range, with low density of the particles, thus implying the need for an external magnetic field, which greatly limits their wider applications.
The scientists summed up the temperature-dependent evolution of the magnetic and structural parameters of the ferrimagnet across an entire temperature range. They noted the expansion of a unit cell of a magnetic compound with increased temperature due to. They also conducted additional neutron powder diffraction studies to calculate the magnetic components and total magnetic moments of the constituting holmium and cobalt atoms.
During additional experiments, Song and team conducted neutron powder diffraction analysis to show the rotating magnetic moment of the holmium-cobalt system with lattice negative thermal expansion at cooling. The spontaneous skyrmions represented very high densities with stability across a wide temperature range. They compared the lattice negative thermal expansion of the holmium-cobalt system and the existence of stable skyrmions by characterizing the outcomes with another compound containing iron to show positive thermal expansion in the latter.
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