Finding Skyrmion in a Strong Permanent Magnet Using Lorentz TEM

Abstract

Lorentz Transmission electron microscopy (LTEM) is one of the powerful instruments to observe thenanoscale structural and the magnetic field features of materials simultaneously. Recently,topological-in-origin robust magnetic skyrmions have been reported in several materials systemsutilizing LTEM, mostly in the noncentrosymmetric B20 crystal system at low temperature, whichlimits the practical application. Here, we report novel hard skyrmions in one of the strongestferromagnets, which can be operated at high temperature above room temperature. This is ofimportance stepping stone since it paves the way for an immense application potential by providinga new approach to make skyrmions in hard magnet materials through appropriate field cooling. Thecontrol and visualization was performed in the LTEM (FEI; Titan80-300) equipped with heatingholder. Various skyrmion like bubbles formed near the skyrmion window will be also discussed inthe presentation.