An electronic noise study of single magnetic skyrmions

While pinning centers tend to impede skyrmion motion, they are essential to reliably positioning and guiding skyrmions as well as to avoiding skyrmion annihilation. A detailed understanding of interactions between skyrmions and pinning centers is hence crucial. In this talk, we will report an electronic noise study of single magnetic skyrmions interacting with local pinning centers in magnetic thin films with different pinning strengths. While telegraph noises are observed in the weak and intermediate-pinning regimes, the 1/f noise of a single skyrmion is noticed in the strong-pinning regime. We examine their microscopic origins through the complementary magnetic imaging as well as micromagnetic simulation studies.