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Stability and Dynamics of Skyrmions in Ultrathin Magnetic Nanodisks Under Strain

37 Pages Posted: 26 Sep 2019 Publication Status: Accepted

See all articles by Jia-Mian Hu

Jia-Mian Hu

University of Wisconsin - Madison - Department of Materials Science and Engineering; Pennsylvania State University - Department of Materials Science and Engineering

Tiannan Yang

Pennsylvania State University - Department of Materials Science and Engineering

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering; Pennsylvania State University - Materials Science Institute

Abstract

Understanding the switching mechanism of magnetic skyrmions is critical for realizing their potential applications in future spintronic devices. Here we study the thermodynamic stability and dynamics of a NĂ©el skyrmion in an ultrathin magnetic nanodisk under biaxial in-plane strains using a combination of phase-field simulations and analytical theory. We demonstrated the switching of a circular skyrmion to a variety of magnetic configurations, including an out-of-plane monodomain or an in-plane vortex under isotropic strains and to an elliptical skyrmion or a stripe domain under anisotropic strains. We successfully formulated a Lagrangian-mechanics-based model to analytically describe the switching dynamics of a skyrmion. Both our simulations and analytical model revealed that the strain-mediated breathing dynamics of skyrmions lead to a counter-intuitive phenomenon in which a lager strain may lead to slower skyrmion-to-monodomain switching.

Keywords: Phase-field Modeling, Skyrmions, Nanostructures, Lagrangian Mechanics

Suggested Citation

Hu, Jia-Mian and Yang, Tiannan and Chen, Long-Qing, Stability and Dynamics of Skyrmions in Ultrathin Magnetic Nanodisks Under Strain. Available at SSRN: https://ssrn.com/abstract=3458135 or http://dx.doi.org/10.2139/ssrn.3458135

Jia-Mian Hu (Contact Author)

University of Wisconsin - Madison - Department of Materials Science and Engineering

Madison, WI 53706
United States

Pennsylvania State University - Department of Materials Science and Engineering ( email )

University Park
State College, PA 16802
United States

Tiannan Yang

Pennsylvania State University - Department of Materials Science and Engineering

University Park
State College, PA 16802
United States

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering ( email )

University Park
State College, PA 16802
United States

Pennsylvania State University - Materials Science Institute ( email )

United States

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