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Colossal spin transfer torque effect on skyrmion along the edge
Junichi Iwasaki1, Wataru Koshibae, Naoto Nagaosa
1Department of Applied Physics, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Nano Letters
|July 3, 2014
Summary
We investigated skyrmion motion along edges using micromagnetic simulations. Skyrmion velocity increases with reduced Gilbert damping and is limited by edge confinement, with collisions being elastic.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Topological magnetic quasiparticles called skyrmions are promising for data storage.
- Controlling skyrmion motion is crucial for device applications.
Purpose of the Study:
- Investigate edge-driven skyrmion motion using transverse currents.
- Analyze factors influencing skyrmion velocity, inertia, and collisions.
Main Methods:
- Micromagnetic simulations were employed to model skyrmion dynamics.
- Simulations focused on skyrmion movement along a material edge under current excitation.
Main Results:
- Skyrmion velocity is inversely proportional to Gilbert damping (α), enhanced by approximately 1/α.
- Maximum velocity is dictated by edge-confining forces.
- Skyrmion inertia arises from the confining potential, with transverse coordinates acting as kinetic momentum.
- Collisions between two skyrmions are nearly elastic, preserving their structure.
Conclusions:
- Edge effects significantly enhance skyrmion velocity and introduce inertia.
- Skyrmion interactions are robust, with collisions causing minimal distortion.
- Findings provide insights for designing efficient skyrmion-based devices.
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