Frequency-selective manipulation of spin waves: micromagnetic texture as amplitude valve and mode modulator

Spin–wave devices are regarded as one of themost promising candidates for future computation and data processing. How tomanipulate spin–wave propagation is a key issue in realizing the functionality of these of devices. The existingmanipulationmethods have serious drawbacks for constructing practical spin–wave devices. Here, we propose an approach to harness the amplitude andmode excitation of traveling spinwaves by introducing uniquemicromagnetic textures in a permalloywaveguide directly exchange-coupled to a pair of cobalt nanomagnets.We demonstrate that the imprinted micromagnetic textures, i.e., the 360° domainwall andmagnetic buckle, which play different roles in spin–wavemanipulation, can be interchangedwith each other repeatedly by using a sequence of homogeneousmagnetic fields.Moreover, the suggested architecture could easily be tailored to implement fundamental logic-NOToperation. In light of the internal-field profile of themicromagnetic textures, speculation is offered concerning the physical origin underlying the observed spin–wave modulation phenomena.