Strain-mediated voltage-controlled switching of magnetic skyrmions in nanostructures

Jia Mian Hu, Tiannan Yang, Long-qing Chen

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Magnetic skyrmions are swirling spin structures stabilized typically by the Dyzaloshinskii-Moriya interaction. The existing control of magnetic skyrmions has often relied on the use of an electric current, which may cause overheating in densely packed devices. Here we demonstrate, using phase-field simulations, that an isolated Néel skyrmion in a magnetic nanodisk can be repeatedly created and deleted by voltage-induced strains from a juxtaposed piezoelectric. Such a skyrmion switching is non-volatile, and consumes only ~0.5 fJ per switching which is about five orders of magnitude smaller than that by current-induced spin-transfer-torques. It is found that the strain-mediated skyrmion creation occurs through an intermediate vortex-like spin structure, and that the skyrmion deletion occurs though a homogenous shrinkage during which the Néel wall is temporarily transformed to a vortex-wall. These findings are expected to stimulate experimental research into strain-mediated voltage control of skyrmions, as well as other chiral spin structures for low-power spintronics.

Original languageEnglish (US)
Article number62
Journalnpj Computational Materials
Volume4
Issue number1
DOIs
StatePublished - Dec 1 2018

Fingerprint

Spin Structure
Nanostructures
Vortex flow
Voltage
Strain control
Magnetoelectronics
Vortex
Induced currents
Electric potential
Electric currents
Voltage control
Spintronics
Electric Current
Torque
Phase Field
Shrinkage
Deletion
Interaction
Demonstrate
Simulation

All Science Journal Classification (ASJC) codes

  • Modeling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Computer Science Applications

Cite this

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title = "Strain-mediated voltage-controlled switching of magnetic skyrmions in nanostructures",
abstract = "Magnetic skyrmions are swirling spin structures stabilized typically by the Dyzaloshinskii-Moriya interaction. The existing control of magnetic skyrmions has often relied on the use of an electric current, which may cause overheating in densely packed devices. Here we demonstrate, using phase-field simulations, that an isolated N{\'e}el skyrmion in a magnetic nanodisk can be repeatedly created and deleted by voltage-induced strains from a juxtaposed piezoelectric. Such a skyrmion switching is non-volatile, and consumes only ~0.5 fJ per switching which is about five orders of magnitude smaller than that by current-induced spin-transfer-torques. It is found that the strain-mediated skyrmion creation occurs through an intermediate vortex-like spin structure, and that the skyrmion deletion occurs though a homogenous shrinkage during which the N{\'e}el wall is temporarily transformed to a vortex-wall. These findings are expected to stimulate experimental research into strain-mediated voltage control of skyrmions, as well as other chiral spin structures for low-power spintronics.",
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Strain-mediated voltage-controlled switching of magnetic skyrmions in nanostructures. / Hu, Jia Mian; Yang, Tiannan; Chen, Long-qing.

In: npj Computational Materials, Vol. 4, No. 1, 62, 01.12.2018.

Research output: Contribution to journalArticle

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