In this work, we present recent developments in magnonic holographic memorydevices exploiting spin waves for information transfer. The devices comprise amagnetic matrix and spin wave generating/detecting elements placed on the edgesof the waveguides. The matrix consists of a grid of magnetic waveguidesconnected via cross junctions. Magnetic memory elements are incorporated withinthe junction while the read-in and read-out is accomplished by the spin wavespropagating through the waveguides. We present experimental data on spin wavepropagation through NiFe and YIG magnetic crosses. The obtained experimentaldata show prominent spin wave signal modulation (up to 20 dB for NiFe and 35 dBfor YIG) by the external magnetic field, where both the strength and thedirection of the magnetic field define the transport between the cross arms. Wealso present experimental data on the 2-bit magnonic holographic memory builton the double cross YIG structure with micro-magnets placed on the top of eachcross. It appears possible to recognize the state of each magnet via theinterference pattern produced by the spin waves with all experiments done atroom temperature. Magnonic holographic devices aim to combine the advantages ofmagnetic data storage with wave-based information transfer. We presentestimates on the spin wave holographic devices performance, including powerconsumption and functional throughput. According to the estimates, magnonicholographic devices may provide data processing rates higher than 10^18bits/cm2/s while consuming 0.15uW. Technological challenges and fundamentalphysical limits of this approach are also discussed.
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