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Radial-spin-wave-mode-assisted vortex-core magnetization reversals
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Model geometry of indicated dimensions and initial vortex ground state, wherein vortex-core magnetization is upward and in-plane curling magnetization is counter-clockwise. The orange arrow indicates theoscillating magnetic fields. On the right is the m z component profile across the core center. (b) Average m z component, 〈m z〉, over entire nanodisk versus time after application of sinc field. The inset shows the sinc function expressed as with = 50 Oe, = 100 GHz and = 1 ns. (c) Power spectrum obtained from method explained in text. The vertical arrows indicate the eigenfrequencies of the radial-mode spin waves. (d) Plane-view images of spatial distributions of FFT powers for n = 1, 2, and 3 modes obtained at corresponding eigenfrequencies 10.7, 15.2, and 20.7 GHz, respectively, along with profiles across center position.

Image of FIG. 2.
FIG. 2.

Snapshot images of temporal evolution of n = 1 radial mode excitation up to vortex-core reversal, with corresponding m z profiles. The field applied was a single harmonic sine-wave field of H 0 = 350 Oe and f H = 10.7 GHz.

Image of FIG. 3.
FIG. 3.

(a) Variation of m z component averaged over core region (i.e., averaged over 4 cells) during excitation of n = 1 radial mode up to vortex-core reversal. (b) Temporal variation of each energy density and sum averaged over core region (r ≤ 4 nm). The gray dashed line shows the maximum exchange energy density, = 2.62 × 106 J/m3, obtained during the vortex-core reversal driven by a perpendicular bias static field, ≈ −5.29 kOe. The numbers on the top of the panel in (a) indicate the times at which the snapshot images shown in Fig. 2 were taken. (c) Same as (b), but for time ranges spanning occurrence of switching events.

Image of FIG. 4.
FIG. 4.

Phase diagrams of (a) switching events and (b) switching times with respect to H 0 and f H. In (a), the large open circles represent the occurrence of vortex-core-reversal events at the indicated H 0 and f H values. The colors, according to the color bar scale (top), represent the values. The solid curves indicate the threshold fields near the radial-mode eigenfrequencies. In (b), the colors in the vortex-core-reversal region, according to the color bar scale (top), correspond to the switching times.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radial-spin-wave-mode-assisted vortex-core magnetization reversals