Burst-mode manipulation of magnonic vortex crystals

Abstract

The manipulation of polarization states in 4 × 4 vortex crystals using sinusoidal magnetic field bursts is investigated by means of a broadband ferromagnetic-resonance setup. Magnetic field excitation with the proper amplitude and frequency allows tuning different polarization states, which are observed in the measured absorption spectra. The variation of the sinusoidal burst width consecutively identifies the time scale of the underlying process. A memorylike polarization state writing process is demonstrated on the submicrosecond time scale.

Band structure engineering of two-dimensional magnonic vortex crystals

“…Thus, the properties of the artificial crystal cannot only be tailored by the geometry of the crystal but also by tuning the polarization configuration. Experimentally, the interaction between the vortices in twodimensional arrangements has been studied [13][14][15][16] and * cbehncke@physnet.uni-hamburg.de collective modes for five vortices have been measured [17]. The band structure of two-dimensional vortex crystals is predicted to strongly depend on the polarization pattern [18][19][20].…”

“…The polarization pattern of the vortex crystal is tuned by self-organized state formation [13,16,22]. Therefore a high frequency current is applied to all three striplines [ Fig.…”

Two-body problem of core-region coupled magnetic vortex stacks

“…2(b). In the next step, the relative polarities of the vortex stacks are changed from equal (p 1 p 2 = 1) to opposite (p 1 p 2 = −1) polarizations using self-organized state formation [19,36,37]. Thereby, the remaining nondegenerate states of opposite polarization are accessible.…”

“…The interaction between laterally arranged elements has been studied for pairs [13,14], chains [15], and two-dimensional arrangements [16][17][18] of vortices. In laterally coupled arrangements it has been shown recently that memorylike writing processes are possible based on the excitation of the gyrotropic mode [19], where bits are stored as polarization patterns. The gyrotropic mode corresponds to a gyration of the vortex core around the center of the disk and can be compared to the oscillation of a harmonic oscillator [20].…”

Collective modes in three-dimensional magnonic vortex crystals

“…We investigate the gyrotropic motions of three different arrangements of vortex stacks in dependence on the polarizations and circularities of the individual vortices. The polarization pattern is controlled by self-organized state formation 24 25 26 . The influence of the vertical and lateral coupling is investigated by comparing different arrangements to calculations within the Thiele model.…”