Regulating the magnetic skyrmion in a confined nanochannel under a gradient magnetic field

Abstract

A magnetic skyrmion could be endowed with various dynamic magnetic configurations and behaviors. By artificially generating a gradient magnetic field in a confined nanochannel, we have shown the magnetic dynamics of an isolated skyrmion, achieving the coexistence of moving and breathing modes. Such a phenomenon has been proven to be not only correlated to the gradient strength of a magnetic field, but also depends on the Dzyaloshinskii-Moriya interaction. By increasing the magnetic field gradient up to 0.1 mT nm −1 , the skyrmion can effectively overcome the skyrmion Hall effect, and meanwhile generate a breathing mode during the motion process under MFG=1.0 mT nm −1 and DMI=2.8 mJ m −3 . The present study could provide an alternative approach to regulate the skyrmion at micro/nanoscales by using a gradient magnetic field.

Dynamic behavior of skyrmion collision: spiral and breath

“…Among these topological spin configurations, magnetic skyrmion has attracted much attention due to its non-coplanarity and topology stability, which is usually regulated by Dzyaloshinskii-Moriya interactions (DMI) in asymmetric chiral magnets [22][23][24] or ultrathin magnetic multilayers [25][26][27]. In the literature, most theoretical investigations of skyrmions focus on the structure evolution and dynamic behavior of skyrmions under various external fields, including the formation, movement, and annihilation of skyrmions [28][29][30][31][32][33][34][35][36][37].…”