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Radiation of spin waves from magnetic vortex cores by their dynamic motion and annihilation processes
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) A spatial distribution of local at equilibrium in a rectangular shaped model system of an Fe film with a lateral dimension of and a 20 nm thickness. Colors in (a) represent the in-plane orientations of the local , as noted by the colored wheel, while the gray-colored scale in (b) indicates the out-of-plane components of the local normalized by its saturation magnetization, . The streamlines with small arrows shown in (b) are displayed to show the characteristic features of individual vortices and antivortices present in the rectangular shaped element.

Image of FIG. 2.
FIG. 2.

(Color online) Images of the temporal evolution of the spatial configuration of local in the area indicated by “A” in Fig. 1(b) under a static magnetic field of applied along the direction noted by the black arrow. The colors indicate the magnitudes of local . (b) and (c) show the temporal variations of the positions and the values, respectively, for the cores of the three different vortices.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Variations of with distance along the lines indicated by “L1” and “L2” in Fig. 2(a), and their Fourier-transformed spectra. (b) Temporal evolutions of in a range of at the two different positions indicated by “P1” and “P2” in Fig. 2(a), and their Fourier transformed spectra.

Image of FIG. 4.
FIG. 4.

(Color online) Plane-view images of the spatial configurations of the two different dominating modes at and 411 ps, which are obtained from the inverse FTs of the frequency spectra of individual cells in the two different ranges of , and , as displayed by the shaded regions in Fig. 3(b).

Image of FIG. 5.
FIG. 5.

(Color online) (a) shows the perspective-view images of the perpendicular component of torques, , exerting on the individual cells in the same area as that seen in Fig. 2, for and 342 ps. Each column in (a) shows , , and contributions to the total torque. (b) shows the temporal variations of the average torques within cells around the cores of the three different vortices shown in Fig. 2. The vertical lines indicate and 342 ps.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radiation of spin waves from magnetic vortex cores by their dynamic motion and annihilation processes