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Skyrmions in anisotropic magnetic fields: strain and defect driven dynamics

Published online by Cambridge University Press:  28 January 2019

Richard Brearton ,
Maciej W. Olszewski ,
Shilei Zhang ,
Morten R. Eskildsen ,
Charles Reichhardt ,
Cynthia J. O. Reichhardt ,
Gerrit van der Laan  and
Thorsten Hesjedal
Richard Brearton
Affiliation:
University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, England Magnetic Spectroscopy Group, Diamond Light Source, Fermi Ave, Didcot OX11 0DE, England
Maciej W. Olszewski
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN46656, U.S.A.
Shilei Zhang
Affiliation:
University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, England
Morten R. Eskildsen
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN46656, U.S.A.
Charles Reichhardt
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM87545, U.S.A.
Cynthia J. O. Reichhardt
Affiliation:
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM87545, U.S.A.
Gerrit van der Laan
Affiliation:
Magnetic Spectroscopy Group, Diamond Light Source, Fermi Ave, Didcot OX11 0DE, England
Thorsten Hesjedal*
Affiliation:
University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, England
*
*(Email: thorsten.hesjedal@physics.ox.ac.uk)
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Abstract

Magnetic skyrmions are particle-like, topologically protected magnetization entities that are promising candidates for information carriers in racetrack-memory schemes. The transport of skyrmions in a shift-register-like fashion is crucial for their embodiment in practical devices. Recently, we demonstrated experimentally that chiral skyrmions in Cu2OSeO3 can be effectively manipulated by a magnetic field gradient, leading to a collective rotation of the skyrmion lattice with well-defined dynamics in a radial field gradient. Here, we employ a skyrmion particle model to numerically study the effects of resultant shear forces on the structure of the skyrmion lattice. We demonstrate that anisotropic peak broadening in experimentally observed diffraction patterns can be attributed to extended linear regions in the magnetic field profile. We show that topological (5-7) defects emerge to protect the six-fold symmetry of the lattice under the application of local shear forces, further enhancing the stability of proposed magnetic field driven devices.

Keywords

magneticmodelingsimulationferromagnetic
Type
Articles
Information
MRS Advances , Volume 4 , Issue 11-12: Electronic, Photonic and Magnetic Materials , 2019 , pp. 643 - 650
Copyright
Copyright © Materials Research Society 2019 

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