Abstract
Spin waves with wavelengths in the nanometre range could serve as data carriers in future magnonic logic or signal processing devices. We investigate the interference of spin waves emitted from magnetic vortices in two exchange-coupled vortex stacks. The spin-wave dynamics are studied using scanning transmission X-ray microscopy and micromagnetic simulations. Stacks of vortices provide an excellent controllability of spin-wave properties including a tunable wavelength in the 100 nm regime and manipulation of their propagation direction via the magnetisation configuration. Furthermore, interference gives rise to amplified or reduced spin-wave amplitudes in distinct areas of the structure providing controlled confinement crucial for future applications of spin waves.
Highlights
Spin waves with wavelengths in the nanometre range could serve as data carriers in future magnonic logic or signal processing devices
We report a direct observation of interferences of spin waves in two exchange-coupled vortex stacks
For the excitation of spin waves, the structures are placed upon a coplanar waveguide
Summary
Spin waves with wavelengths in the nanometre range could serve as data carriers in future magnonic logic or signal processing devices. We investigate the interference of spin waves emitted from magnetic vortices in two exchange-coupled vortex stacks. Stacks of vortices provide an excellent controllability of spin-wave properties including a tunable wavelength in the 100 nm regime and manipulation of their propagation direction via the magnetisation configuration. When excited by magnetic fields or electric currents, the vortex core gyrates around its centre position[13,14]. We use micromagnetic simulations[20] and scanning transmission X-ray microscopy (STXM) measurements at the MAXYMUS microscope of the BESSY II synchrotron in Berlin, Germany, to observe the spin-wave dynamics temporally and spatially resolved. Different stable magnetisation configurations and their dynamic response to high-frequency magnetic fields are investigated. Spin waves emitted by the vortex stacks interfere with each other, resulting in different interference patterns dependent on their magnetisation state. We directly observe spin-wave interference and spin-wave diffraction patterns
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