Finding a New Magnetic Skyrmion Structure Using Lorentz TEM

Abstract

Lorentz Transmission electron microscopy (LTEM) is one of the powerful instruments to observe the nanoscale structural and the magnetic field features of materials simultaneously. Also it shows in-plane magnetization direction to the field. Thus it is good compensating imaging tool with other out-of-plane ones such as Kerr, STXM or MFM.Recently, topological-in-origin robust magnetic skyrmions have been reported in sesveral mateiral systems utilizing LTEM, mostly in the noncentrysymmetric B20 crystal system at low temperature, which limits the practical application. Here, we report novel hard skyrmions in one of the strongest ferromagnets, which can be operated at high tempearture above room temperature. This is of importance stepping stone since it pave the way for an immense application potential by providing a new approach to make skyrmions in hard magnet materials through approporiate field cooling. The control and visuallization was performed in the LTEM (FEI; Titan) equipped with heating holder. Various skyrmion like bubbles formed near the skyrmion window will be also discussed in the presentation.