Finding Skyrmion in a Strong Permanent Magnet Using Lorentz TEM

Abstract

Lorentz Transmission electron microscopy (LTEM) is one of the powerful instruments to observe the nanoscalestructural and the magnetic field features of materials simultaneously. Recently, topological-in-origin robustmagnetic skyrmions have been reported in sesveral mateiral systems utilizing LTEM, mostly in thenoncentrysymmetric B20 crystal system at low temperature, which limits the practical application. Here, we reportnovel hard skyrmions in one of the strongest ferromagnets, which can be operated at high tempearture above roomtemperature. This is of importance stepping stone since it pave the way for an immense application potential byproviding a new approach to make skyrmions in hard magnet materials through approporiate field cooling. Thecontrol and visuallization was performed in the LTEM (FEI; Titan) equipped with heating holder. Various skyrmionlike bubbles formed near the skyrmion window will be also discussed in the presentation.