Nonlinear Dynamics in Spin Vortex Pairs With Strong Core-Core Coupling

作者：Koop Bjorn Casper^*; Ivanov Boris A; Korenivski Vladislav

来源：IEEE Transactions on Magnetics, 2014, 50(11): 4300504.

DOI：10.1109/TMAG.2014.2327157

• Microwave spectra
• nonlinear dynamics
• rotational and gyrational resonances
• spin vortex pairs

We investigate the dynamics of spin vortex pairs in magnetic multilayer particles, with the vortices closely spaced vertically and therefore with strong core-core coupling. We focus on the spin-dynamic behavior of the system beyond the linear small-signal regime, and on the state with antiparallel vortex chiralities and parallel cores, in which the vortex cores are strongly dipole coupled. The data show a clear transition from the dominant single rotational resonance at 2-3 GHz for small excitation field amplitudes to a dominant gyrational resonance at high excitation fields. The concomitant changes in the microwave spectra, seen as satellite resonances near the rotational peak as well as a pronounced low-frequency resonance, are interpreted as arising from the nonlinearities of the main rotational mode, which also mediate microwave power transfer from the high-to the low-frequency mode.

• 出版日期2014-11