Mutual control of coherent spin waves and magnetic domain walls in a magnonic device*

Spin waves, the collective excitation of electronic spins inside magnetic materials, offer new opportunities for wave-based computing. The successful implementation of spin wave devices requires efficient modulation of spin wave propagation. Here we experimentally demonstrate that nanometer wide magnetic domain walls can be used to manipulate the phase and magnitude of coherent spin waves in a non-volatile manner. Besides using magnetic domain walls to control the transmission of spin waves, we further show that a spin wave can in turn be used to move the position of magnetic domain walls, via the spin transfer torque effect generated from magnon spin current. This mutual interaction between spin waves and magnetic domain walls opens up the possibility of realizing all-magnon spintronic devices, where one spin wave signal can be used to control others via reconfiguring magnetic domain structures.