Parallel Read-Out and Database Search With Magnonic Holographic Memory

In this paper, we present the most recent results on the development of magnonic holographic memory (MHM). MHM is a type of holographic device, which uses spin waves for data transfer and processing. The most appealing properties of MHM include parallel read-out and database search. We present experimental data showing parallel read-out of four magnetic memory states. In this experiment, the internal magnetic state is recognized by the level of the output inductive voltage produced by the spin-wave interference. We also present the experimental data showing database search in the MHM. In this experiment, the search for the maximum output is accomplished by utilizing spin-wave superposition. The experiments were carried out for six- and eight-terminal yttrium iron garnet-based prototypes. Potentially, magnonic holographic devices can be implemented as complementary memory/logic units to digital processors. Physical limitations and technological constraints of the spin-wave approach are also discussed.