Coupled oscillations of vortex cores confined in a ferromagnetic elliptical disk

Hiroshi Hata, Minori Goto, Akinobu Yamaguchi, Tomonori Sato, Yoshinobu Nakatani, Yukio Nozaki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


By solving the Thiele equation with simultaneous application of a radio-frequency (rf) magnetic field (hrf) and an rf spin current (jsp), the dynamic susceptibility of exchange-coupled vortices in response to hrf and jsp was obtained. It was found that the four eigenmodes expected for two vortices trapped in a magnetic elliptical disk were coupled to different components of hrf and jsp. As a consequence, orthogonal hrf and jsp (which are simultaneously generated by the application of an rf current to an elliptical disk) can excite two modes with different eigenfrequencies. This result suggests that a fieldlike nonadiabatic torque caused by an rf spin current can be spectroscopically distinguished from the one caused by the rf magnetic field.

Original languageEnglish
Article number104418
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 2014 Sept 22

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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