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Perpendicular-bias-field-dependent vortex-gyration eigenfrequency
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Ground vortex state (left) and core-shifted state (right) with upward core magnetization and counter-clockwise (CCW) in-plane curling magnetization in Py disk of diameter 2R = 600 nm and thickness L = 30 nm. The colors and heights represent the local in- and out-of-plane magnetization components, respectively. (b) Average mx component 〈mx 〉 over whole disk vs time under perpendicular bias fields of indicated strength H p, during relaxation process after vortex core is shifted. (c) FFT power spectra for different H p values, obtained from FFTs of 〈mx 〉 oscillations over t = 0-100 ns range.

Image of FIG. 2.
FIG. 2.

(Color online) H p dependence of ω 0 (closed circles), obtained from FFT power spectra [Fig. 1(c)], compared with results for κ(H p)/G(H p) (open circles) obtained from H p-dependent G and κ values (see Fig. 3), also obtained directly from simulation data. The solid line indicates the result of Eq. (2) reported in Ref. 15.

Image of FIG. 3.
FIG. 3.

(Color online) Dependences of dynamic variables G and D on H p. The open circles show the simulation results obtained through , . The solid line corresponds to the result obtained from an explicit expression of , as reported in Ref. 15, where H s = 10 kOe was used for our nanodot dimensions.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Calculated total energy W(X) vs |X|2 for H p = 0 kOe. The solid line indicates a linear fit to the simulation results (dots). (b) Dependence of κ on H p. The open circles indicate values obtained directly from the simulation results, while the solid line corresponds to the result for reported in Ref. 15. The inset shows the comparison of the core-region m z profiles for H p = +3 and −3 kOe.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Perpendicular-bias-field-dependent vortex-gyration eigenfrequency