Magnus Induced Diode Effect for Skyrmions in Channels with Periodic Potentials

Abstract

Using a particle based model, we investigate the skyrmion dynamical behavior in a channel where the upper wall contains divots of one depth and the lower wall contains divots of a different depth. Under an applied driving force, skyrmions in the channels move with a finite skyrmion Hall angle that deflects them toward the upper wall for $-x$ direction driving and the lower wall for $+x$ direction driving. When the upper divots have zero height, the skyrmions are deflected against the flat upper wall for $-x$ direction driving and the skyrmion velocity depends linearly on the drive. For $+x$ direction driving, the skyrmions are pushed against the lower divots and become trapped, giving reduced velocities and a nonlinear velocity-force response. When there are shallow divots on the upper wall and deep divots on the lower wall, skyrmions get trapped for both driving directions; however, due to the divot depth difference, skyrmions move more easily under $-x$ direction driving, and become strongly trapped for $+x$ direction driving. The preferred $-x$ direction motion produces what we call a Magnus diode effect since it vanishes in the limit of zero Magnus force, unlike the diode effects observed for asymmetric sawtooth potentials. We show that the transport curves can exhibit a series of jumps or dips, negative differential conductivity, and reentrant pinning due to collective trapping events. We also discuss how our results relate to recent continuum modeling on a similar skyrmion diode system.

14 pages, 9 figures

References in corpus (14)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Rectification of electronic heat current by a hybrid thermal diode
• Superconducting diode effect via conformal-mapped nanoholes
• Reversible Vortex Ratchet Effects and Ordering in Superconductors with Simple Asymmetric Potential Arrays
• Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator
• Skyrmion ratchet propagation: Utilizing the skyrmion Hall effect in AC racetrack storage devices
• Reversible Vector Ratchets for Skyrmion Systems
• Practical vortex diodes from pinning enhanced YBa2Cu3O7-d
• Skyrmion Ratchet in Funnel Geometries
• Guided Skyrmion Motion Along Pinning Array Interfaces
• Clogging, Diode and Collective Effects of Skyrmions in Funnel Geometries
• Drive Dependence of the Hall Angle for a Sliding Wigner Crystal in a Magnetic Field

Cited by in corpus (1)

• Channeling Skyrmions: suppressing the skyrmion Hall effect in ferrimagnetic nanostripes