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Conventional magnonic devices use three classes of magnetostatic waves that require detailed manipulation of magnetization structure that makes the design and the device/circuitry scalability difficult tasks. Here, we demonstrate that devices based on topological exchange spin waves do not suffer from the problem with additional nice features of nano-scale wavelength and high frequency. Two results are reported. 1) A perpendicular ferromagnet on a honeycomb lattice is generically a topological magnetic material in the sense that topologically protected chiral edge spin waves exist in the band gap as long as spin-orbit induced nearest-neighbor pseudodipolar interaction (and/or next-nearest neighbor Dzyaloshinskii-Moriya interaction) is present. 2) As a proof of concept, spin wave beamsplitters and spin wave interferometers are designed by using domain walls to manipulate the propagation of topologically protected chiral spin waves. Since magnetic domain walls can be controlled by magnetic fields or electric current/fields, one can essentially draw, erase and redraw different spin wave devices and circuitry on the same magnetic plate so that the proposed devices are reconfigurable and tunable. Devices made from magnetic topological materials are robust against both internal and external perturbations such as the spin wave frequency variation and device geometry as well as defects.
We show that topological transitions in electronic spin transport are feasible by a controlled manipulation of spin-guiding fields. The transitions are determined by the topology of the fields texture through an effective Berry phase (related to the
Artificial spin ices are ensembles of geometrically-arranged, interacting nanomagnets which have shown promising potential for the realization of reconfigurable magnonic crystals. Such systems allow for the manipulation of spin waves on the nanoscale
Artificial square spin ices are structures composed of magnetic elements arranged on a geometrically frustrated lattice and located on the sites of a two-dimensional square lattice, such that there are four interacting magnetic elements at each verte
Strongly-interacting artificial spin systems are moving beyond mimicking naturally-occuring materials to find roles as versatile functional platforms, from reconfigurable magnonics to designer magnetic metamaterials. Typically artificial spin systems
In this work, we study experimentally by broadband ferromagnetic resonance measurements, the dependence of the spin-wave excitation spectra on the magnetic applied field in CoFeB meander-shaped films. Two different orientations of the external magnet