Abstract
In this work, we consider the possibility of building magnonic holographic read-only memory (MH-ROM) devices exploiting spin-wave interference for readout. MH-ROM consists of a grid of magnetic waveguides connected via cross junctions. Some of the cross junctions have a hole in the center of junctions, whereas others do not. The presence/absence of the hole is assigned to the memory states 0 and 1, respectively. We present experimental data showing spin-wave propagation modification in the Permalloy cross junction due to the presence of the hole. The results show prominent spin-wave modulation which is applicable for application in MH-ROM. Similar to the optical compact-disk ROM (CD-ROM), the internal memory states can be recognized via spin-wave interference. The advantages of using of spin waves instead of optical beams are scalability and compatibility with conventional electronic devices. The memory density scales inversely proportional to the operational wavelength. According to the estimates, the memory density of MH-ROM can be 1 Tb/cm 2 at wavelength λ = 100 nm. We discuss the physical limitations and physical constrains associated with the spin-wave interference. The development of MH-ROMs opens a new horizon for building scalable holographic devices compatible with conventional electronic devices.
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