Two-dimensional (2D) van der Waals (vdW) magnet with the advent of ferromagnetism has stimulated particular attention in exploring topological spin texture especially for skyrmions. We here report the real-space observation of tuning the density of field free skyrmions in Fe3GeTe2(FGT), which can serve as a new application for spintronic devices. By tilting the FGT nanosheet, we found that the field-free Bloch-type skyrmions can also represent an invisible contrast when the tilt angle is zero, but emerge a reversal magnetic contrast at high tilt angle. These findings shed light on the identification of the spin configuration in 2D vdW magnet.
- Bei Ding
- Xue Li
- Wenhong Wang