When Bloch point hops through magnetic multilayers

(Abstract) Magnetic multilayers are promising tunable systems for hosting magnetic skyrmions at/above room temperature. Revealing their intriguing switching mechanisms and associated inherent electrical responses are prerequisites for developing skyrmionic devices. In this Letter, we theoretically demonstrate the annihilation of single skyrmions occurring through a multilayer structure, which is mediated by the hopping dynamics of topological hedgehog singularities known as Bloch points. The emerging intralayer dynamics of Bloch points are dominated by the Dzyaloshinskii-Moriya interaction, and their propagation can give rise to solenoidal emergent electric fields in the vicinity. Moreover, as the topology of spin textures can dominate their emergent magnetic properties, we show that the Bloch-point hopping through the multilayer will modulate the associated topological Hall response, with the magnitude proportional to the effective topological charge. We also investigate the thermodynamic stability of these states regarding the layer-dependent magnetic properties. This study casts light on the emergent electromagnetic signatures of skyrmion-based spintronics, rooted in magnetic-multilayer systems.

 Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures
Y. Li*, S. Mankovsky, S. Polesya, H. Ebert, and C. Moutafis*
Physical Review B (letter) 104, L140409 (2021).

Join the conversation

comment 1 comment
  • Charlespreno

    BTC may be the latest or last chance to get rich in this era. It will reach $200000 next year or the next year.

    BTC has increased 20 times in the last year, and other coins have increased 800 times

    Think about only $2 a few years ago. Come to the world’s largest and safest virtual currency exchange Binance to Get free rewards. Don’t miss the most important opportunity in life


Leave a comment

Your email address will not be published.