Dynamics and inertia of a skyrmion in chiral magnets and interfaces: A linear response approach based on magnon excitations
Abstract
We derive the skyrmion dynamics in response to a weak external drive, taking all the magnon modes into account. A skyrmion has rotational symmetry, and the magnon modes can be characterized by an angular momentum. For a weak distortion of a skyrmion, only the magnon modes with an angular momentum | m | = 1 govern the dynamics of skyrmion topological center. We also determine that the skyrmion inertia comes by way of the magnon modes in the continuum spectrum. For a skyrmion driven by a magnetic field gradient or by a spin transfer torque generated by a current, the dynamical response is practically instantaneous. This justifies the rigid skyrmion approximation used in Thiele's collective coordinate approach. For a skyrmion driven by a spin Hall torque, the torque couples to the skyrmion motion through the magnons in the continuum and damping; therefore the skyrmion dynamics shows sizable inertia in this case. The trajectory of a skyrmion is an ellipse for an ac drive of spin Hall torque.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1394985
- Alternate Identifier(s):
- OSTI ID: 1368611
- Report Number(s):
- LA-UR-17-26376
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702841
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Material Science
Citation Formats
Lin, Shi-Zeng. Dynamics and inertia of a skyrmion in chiral magnets and interfaces: A linear response approach based on magnon excitations. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.96.014407.
Lin, Shi-Zeng. Dynamics and inertia of a skyrmion in chiral magnets and interfaces: A linear response approach based on magnon excitations. United States. https://doi.org/10.1103/PhysRevB.96.014407
Lin, Shi-Zeng. Thu .
"Dynamics and inertia of a skyrmion in chiral magnets and interfaces: A linear response approach based on magnon excitations". United States. https://doi.org/10.1103/PhysRevB.96.014407. https://www.osti.gov/servlets/purl/1394985.
@article{osti_1394985,
title = {Dynamics and inertia of a skyrmion in chiral magnets and interfaces: A linear response approach based on magnon excitations},
author = {Lin, Shi-Zeng},
abstractNote = {We derive the skyrmion dynamics in response to a weak external drive, taking all the magnon modes into account. A skyrmion has rotational symmetry, and the magnon modes can be characterized by an angular momentum. For a weak distortion of a skyrmion, only the magnon modes with an angular momentum | m | = 1 govern the dynamics of skyrmion topological center. We also determine that the skyrmion inertia comes by way of the magnon modes in the continuum spectrum. For a skyrmion driven by a magnetic field gradient or by a spin transfer torque generated by a current, the dynamical response is practically instantaneous. This justifies the rigid skyrmion approximation used in Thiele's collective coordinate approach. For a skyrmion driven by a spin Hall torque, the torque couples to the skyrmion motion through the magnons in the continuum and damping; therefore the skyrmion dynamics shows sizable inertia in this case. The trajectory of a skyrmion is an ellipse for an ac drive of spin Hall torque.},
doi = {10.1103/PhysRevB.96.014407},
journal = {Physical Review B},
number = 1,
volume = 96,
place = {United States},
year = {Thu Jul 06 00:00:00 EDT 2017},
month = {Thu Jul 06 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
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