Control and manipulation of a magnetic skyrmionium in nanostructures
By Xichao Zhang, J. Xia, Yan Zhou, Daowei Wang, Xiaoxi Liu, Weisheng Zhao, M. Ezawa. 2016
162 citations recorded by the source corpus.
A magnetic skyrmionium is a nontopological soliton, which has a doughnut-like out-of-plane spin texture in thin films, and can be phenomenologically viewed as a coalition of two topological magnetic skyrmions with opposite topological numbers. Due to its zero topological number ($Q=0$) and doughnut-like structure, the skyrmionium has its distinctive characteristics as compared to the skyrmion with $Q=\ifmmode\pm\else\textpm\fi{}1$. Here we systematically study the generation, manipulation, and motion of a skyrmionium in ultrathin magnetic nanostructures by applying a magnetic field or a spin-polarized current. It is found that the skyrmionium moves faster than the skyrmion when they are driven by the out-of-plane current, and their velocity difference is proportional to the driving force. However, the skyrmionium and skyrmion exhibit an identical current-velocity relation when they are driven by the in-plane current. It is also found that a moving skyrmionium is less deformed in the current-in-plane geometry compared with the skyrmionium in the current-perpendicular-to-plane geometry. Furthermore we demonstrate the transformation of a skyrmionium with $Q=0$ into two skyrmions with $Q=+1$ in a nanotrack driven by a spin-polarized current, which can be seen as the unzipping process of a skyrmionium. We illustrate the energy and spin structure variations during the skyrmionium unzipping process, where linear relations between the spin structure and energies are found. These results could have technological implications in the emerging field of skyrmionics.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/6808f34bdd68efb23f2609c33366e52a063c20b2
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Optical skyrmions and other topological quasiparticles of light (2022, unknown): “Skyrmions have many generalized forms in the quasi-particle family, a typical example of which is skyrmio-nium, a coupled state connecting two skyrmions with opposite polarities and resulting into skyrmion number of s = 1 − 1 = 0 [30].”
- Beyond skyrmions: Review and perspectives of alternative magnetic quasiparticles (2020, background): “Furthermore, their generation has been predicted by the perpendicular injection of spin currents [27, 182, 186] or via alternating the out-of-plane orientation of an external magnetic field [181].”
- Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications (2019, background): “like spin textures that will be discussed throughout this review. In fact, chiral magnetic skyrmions are not limited to the case of topological charges |Q| = 1, and could be of any topological charge [24, 58, 59, 60]. For example, the skyrmionium can be regarded as a topological combination of a sky”