V. K. Bharadwaj

Magnetic skyrmions are particle-like spin structures with a whirling magnetization structure. Since their discovery in 2009, they have been extensively studied due to their topological stability and their potential use as building blocks for information processing/storageand novel spintronics applications. The fact that magnetic skyrmions are easily manipulated by currents, led to a lot of experiments trying to understand the dynamics of skyrmions using currents and spin waves. So far, the creation, annihilation and manipulation of magnetic skyrmions have been realized in perpendicularly magnetized systems.

My research focuses on skyrmions in in-plane magnets. Analogous to skyrmion, the in-plane skyrmions (bimeron) is a topological spin texture in in-plane magnet consisting of a vortex-antivortex pair (a meron and an antimeron) each carrying a half of the topological charge. We study their stability, creation and manipulation by currents and their dynamical excitations. In my work , we employ both numerical micromagnetic simulations and analytical techniques to address the basic principles of skyrmions interactions and their dynamics.

 

In-plane skyrmion
Phase diagram of a monoclinic Cm magnet as a function of the in-plane and interfacial reduced Dzyaloshinskii coupling constants.

 

Publication:

  1. Ricardo Zarzuela, Venkata Krishna Bharadwaj, Kyoung-Whan Kim, Jairo Sinova, and Karin Everschor-Sitte,  "Stability and dynamics of in-plane skyrmions in collinear ferromagnets", Phys. Rev. B 101, 054405 (2020)