Magnetic Relaxation Dynamics in Skyrmion Host Co₈Zn₇Mn₅

Skyrmions are topologically protected, vortex-like spin textures. These robust spin configurations have become the focus of numerous studies, especially in applied physics, due to their potential applications in magnetic storage devices and futuristic computing technologies. Recently, Co-Zn-Mn compounds have garnered immense attention due to the presence of a skyrmion phase near room temperature, bringing skyrmions a step closer to practical applications. In most cases, the skyrmion phase in this family of compounds have been extensively studied using small angle neutron scattering (SANS) technique. Ac susceptibility is widely recognized as a promising method for identifying different magnetic phases and examining their relaxation dynamics. Here, we present a detailed investigation of the frequency dependent ac susceptibility study in Co₈Zn₇Mn₅ covering a range of 1kHz to 10KHz. The Cole-Cole analysis suggests a Debye-like relaxation, marked by a uniform distribution of relaxation times across a field that encompasses all magnetic phases, from helical to conical and skyrmion phase. Unlike the other chiral magnets, the high Curie temperature (~258K​) of the present system enables shorter switching times, necessitating higher frequencies to effectively probe the relaxation dynamics. The adiabatic susceptibility exhibits a nonmonotonic variation across different magnetic phases, transitioning from helical to conical, conical to skyrmionic, and skyrmionic back to conical. The field dependent relaxation time across different magnetic phases is of the order of 10^-5s, reflecting the fast magnetization dynamics. The current investigation of the relaxation dynamics in the skyrmion host Co₈Zn₇Mn₅ makes a significant contribution to our basic understanding of the dynamical features of skyrmions and their possible uses.