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Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator
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Date
2022-08
Publication Type
Journal Article
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yes
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Abstract
Magnetic skyrmions are compact chiral spin textures that exhibit a rich variety of topological phenomena and hold potential for the development of high-density memory devices and novel computing schemes driven by spin currents. Here, we demonstrate the room-temperature interfacial stabilization and current-driven control of skyrmion bubbles in the ferrimagnetic insulator Tm3Fe5O12 coupled to Pt, showing the current-induced motion of individual skyrmion bubbles. The ferrimagnetic order of the crystal together with the interplay of spin–orbit torques and pinning determine the skyrmion dynamics in Tm3Fe5O12 and result in a strong skyrmion Hall effect characterized by a negative deflection angle and hopping motion. Further, we show that the velocity and depinning threshold of the skyrmion bubbles can be modified by exchange coupling Tm3Fe5O12 to an in-plane magnetized Y3Fe5O12 layer, which distorts the spin texture of the skyrmions and leads to directional-dependent rectification of their dynamics. This effect, which is equivalent to a magnetic ratchet, is exploited to control the skyrmion flow in a racetrack-like device.
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published
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17
Pages / Article No.
834 - 841
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03918 - Fiebig, Manfred / Fiebig, Manfred
03986 - Gambardella, Pietro / Gambardella, Pietro
03906 - Degen, Christian / Degen, Christian
Notes
Funding
200465 - Interconversion of charge, spin and heat currents in spintronic devices (SNF)
178825 - Dynamical processes in systems with strong electronic correlations (SNF)
694955 - In-situ second harmonic generation for emergent electronics in transition-metal oxides (EC)
SEED-20 19-2 - Electrical manipulation and imaging of domains in antiferromagnets (ETHZ)
178825 - Dynamical processes in systems with strong electronic correlations (SNF)
694955 - In-situ second harmonic generation for emergent electronics in transition-metal oxides (EC)
SEED-20 19-2 - Electrical manipulation and imaging of domains in antiferromagnets (ETHZ)
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