Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

doi:10.1088/1367-2630/17/7/073034

Title: Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

Abstract

We show using numerical simulations that pronounced ratchet effects can occur for ac driven skyrmions moving over asymmetric quasi-one-dimensional substrates. We find a new type of ratchet effect called a Magnus-induced transverse ratchet that arises when the ac driving force is applied perpendicular rather than parallel to the asymmetry direction of the substrate. This transverse ratchet effect only occurs when the Magnus term is finite, and the threshold ac amplitude needed to induce it decreases as the Magnus term becomes more prominent. Ratcheting skyrmions follow ordered orbits in which the net displacement parallel to the substrate asymmetry direction is quantized. As a result, skyrmion ratchets represent a new ac current-based method for controlling skyrmion positions and motion for spintronic applications.

Authors:: Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

Publication Date:: Wed Jul 01 00:00:00 EDT 2015

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1239044

Alternate Identifier(s):: OSTI ID: 1222592; OSTI ID: 1235938; OSTI ID: 1239047

Report Number(s):: LA-UR-15-23457
Journal ID: ISSN 1367-2630

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Published Article

Journal Name:: New Journal of Physics

Additional Journal Information:: Journal Volume: 17; Journal Issue: 7; Journal ID: ISSN 1367-2630

Publisher:: IOP Publishing

Country of Publication:: United Kingdom

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; skyrmion; ratchet; substrate; 36 MATERIALS SCIENCE

Citation Formats


                    Reichhardt, C., Ray, D., and Reichhardt, C. J. Olson. Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates.  United Kingdom: N. p., 2015. 
Web.  doi:10.1088/1367-2630/17/7/073034.

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                    Reichhardt, C., Ray, D., & Reichhardt, C. J. Olson. Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates.  United Kingdom.  https://doi.org/10.1088/1367-2630/17/7/073034

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                    Reichhardt, C., Ray, D., and Reichhardt, C. J. Olson. Wed .  
"Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates".  United Kingdom.  https://doi.org/10.1088/1367-2630/17/7/073034.

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@article{osti_1239044,

  title        = {Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates},

  author       = {Reichhardt, C. and Ray, D. and Reichhardt, C. J. Olson},

  abstractNote = {We show using numerical simulations that pronounced ratchet effects can occur for ac driven skyrmions moving over asymmetric quasi-one-dimensional substrates. We find a new type of ratchet effect called a Magnus-induced transverse ratchet that arises when the ac driving force is applied perpendicular rather than parallel to the asymmetry direction of the substrate. This transverse ratchet effect only occurs when the Magnus term is finite, and the threshold ac amplitude needed to induce it decreases as the Magnus term becomes more prominent. Ratcheting skyrmions follow ordered orbits in which the net displacement parallel to the substrate asymmetry direction is quantized. As a result, skyrmion ratchets represent a new ac current-based method for controlling skyrmion positions and motion for spintronic applications.},

  doi          = {10.1088/1367-2630/17/7/073034},

  journal      = {New Journal of Physics},

  number       = 7,

  volume       = 17,

  place        = {United Kingdom},

  year         = {Wed Jul 01 00:00:00 EDT 2015},

  month        = {Wed Jul 01 00:00:00 EDT 2015}

}

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Title: Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

Abstract

Citation Formats

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Skyrmion Lattice in a Chiral Magnet journal, February 2009

Real-space observation of a two-dimensional skyrmion crystal journal, June 2010

Spontaneous atomic-scale magnetic skyrmion lattice in two dimensions journal, July 2011

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Topological properties and dynamics of magnetic skyrmions journal, December 2013

A new class of chiral materials hosting magnetic skyrmions beyond room temperature journal, July 2015

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Blowing magnetic skyrmion bubbles journal, June 2015

Spin Transfer Torques in MnSi at Ultralow Current Densities journal, December 2010

Emergent electrodynamics of skyrmions in a chiral magnet journal, February 2012

Skyrmion flow near room temperature in an ultralow current density journal, January 2012

Universal current-velocity relation of skyrmion motion in chiral magnets journal, February 2013

Driven Skyrmions and Dynamical Transitions in Chiral Magnets journal, May 2013

Particle model for skyrmions in metallic chiral magnets: Dynamics, pinning, and creep journal, June 2013

Collective Transport Properties of Driven Skyrmions with Random Disorder journal, May 2015

The flux-line lattice in superconductors journal, November 1995

Skyrmions on the track journal, March 2013

Nucleation, stability and current-induced motion of isolated magnetic skyrmions in nanostructures journal, October 2013

Magnetic Domain-Wall Racetrack Memory journal, April 2008

Magnetic Domain-Wall Logic journal, September 2005

Dynamics and inertia of skyrmionic spin structures journal, February 2015

Capturing of a magnetic skyrmion with a hole journal, February 2015

Quantized transport for a skyrmion moving on a two-dimensional periodic substrate journal, March 2015

Thermally driven ratchet motion of a skyrmion microcrystal and topological magnon Hall effect journal, January 2014

Brownian motors: noisy transport far from equilibrium
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Directional motion of brownian particles induced by a periodic asymmetric potential
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Directed Transport of Atoms in a Hamiltonian Quantum Ratchet
journal, November 2009

Transitions in the horizontal transport of vertically vibrated granular layers
journal, December 1999

Directing cell motions on micropatterned ratchets
journal, June 2009

Shift registers based on magnetic domain wall ratchets with perpendicular anisotropy
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Reducing vortex density in superconductors using the ‘ratchet effect’
journal, July 1999

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journal, December 1999

Collective Interaction-Driven Ratchet for Transporting Flux Quanta
journal, October 2001

A Superconducting Reversible Rectifier That Controls the Motion of Magnetic Flux Quanta
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Controlled multiple reversals of a ratchet effect
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Reversible vortex ratchet effects and ordering in superconductors with simple asymmetric potential arrays
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Real-space observation of a two-dimensional skyrmion crystal
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Spontaneous atomic-scale magnetic skyrmion lattice in two dimensions
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Observation of Skyrmions in a Multiferroic Material
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Topological properties and dynamics of magnetic skyrmions
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A new class of chiral materials hosting magnetic skyrmions beyond room temperature
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