Large amplitude vortex gyration in permalloy/ Bi2Se3 -like heterostructures

P. N. Skirdkov, K. A. Zvezdin, A. D. Belanovsky, J. M. George, J. C. Wu, V. Cros, A. K. Zvezdin

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We consider the excitation of large amplitude gyrotropic vortex core precession in a permalloy nanodisk by the torques originating from the in-plane microwave current flowing along the interface of the permalloy/Bi2Se3 heterostructures, in which the huge charge-to-spin conversion ratio is observed [A. Mellnik et al., Nature 511, 449 (2014)NATUAS0028-083610.1038/nature13534]. We consider analytically and by micromagnetic modeling the dependence of this excitation on the frequency and magnitude of the microwave current. The analogies of the vortex dynamics and the Landau phase-transition theory are demonstrated. These findings open the possibility to excite gyrotropic vortex motion with the current densities far lower than by any other means.

Original languageEnglish
Article number094432
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number9
DOIs
Publication statusPublished - 2015 Sep 18

Fingerprint

gyration
Permalloys (trademark)
Heterojunctions
Vortex flow
vortices
Microwaves
microwaves
precession
excitation
torque
Current density
Torque
Phase transitions
current density

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Skirdkov, P. N. ; Zvezdin, K. A. ; Belanovsky, A. D. ; George, J. M. ; Wu, J. C. ; Cros, V. ; Zvezdin, A. K. / Large amplitude vortex gyration in permalloy/ Bi2Se3 -like heterostructures. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 92, No. 9.
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Large amplitude vortex gyration in permalloy/ Bi2Se3 -like heterostructures. / Skirdkov, P. N.; Zvezdin, K. A.; Belanovsky, A. D.; George, J. M.; Wu, J. C.; Cros, V.; Zvezdin, A. K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 9, 094432, 18.09.2015.

Research output: Contribution to journalArticle

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AU - Zvezdin, K. A.

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AU - Wu, J. C.

AU - Cros, V.

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AB - We consider the excitation of large amplitude gyrotropic vortex core precession in a permalloy nanodisk by the torques originating from the in-plane microwave current flowing along the interface of the permalloy/Bi2Se3 heterostructures, in which the huge charge-to-spin conversion ratio is observed [A. Mellnik et al., Nature 511, 449 (2014)NATUAS0028-083610.1038/nature13534]. We consider analytically and by micromagnetic modeling the dependence of this excitation on the frequency and magnitude of the microwave current. The analogies of the vortex dynamics and the Landau phase-transition theory are demonstrated. These findings open the possibility to excite gyrotropic vortex motion with the current densities far lower than by any other means.

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