Magnonic Holographic Memory: from Proposal to Device

TL;DR

This paper reports on the development and experimental validation of magnonic holographic memory devices that use spin waves for high-speed, low-power data storage and transfer, demonstrating room-temperature operation and potential for large data throughput.

Contribution

It introduces a practical magnonic holographic memory device with experimental data, showing room-temperature operation and high data processing potential.

Findings

Spin wave modulation up to 35 dB observed in YIG structures.

Successful recognition of magnetic states via interference patterns.

Estimated data processing rates exceeding 10^18 bits/cm2/s.

Abstract

In this work, we present recent developments in magnonic holographic memory devices exploiting spin waves for information transfer. The devices comprise a magnetic matrix and spin wave generating/detecting elements placed on the edges of the waveguides. The matrix consists of a grid of magnetic waveguides connected via cross junctions. Magnetic memory elements are incorporated within the junction while the read-in and read-out is accomplished by the spin waves propagating through the waveguides. We present experimental data on spin wave propagation through NiFe and YIG magnetic crosses. The obtained experimental data show prominent spin wave signal modulation (up to 20 dB for NiFe and 35 dB for YIG) by the external magnetic field, where both the strength and the direction of the magnetic field define the transport between the cross arms. We also present experimental data on the 2-bit magnonic holographic memory built on the double cross YIG structure with micro-magnets placed on the top of each cross. It appears possible to recognize the state of each magnet via the interference pattern produced by the spin waves with all experiments done at room temperature. Magnonic holographic devices aim to combine the advantages of magnetic data storage with wave-based information transfer. We present estimates on the spin wave holographic devices performance, including power consumption and functional throughput. According to the estimates, magnonic holographic devices may provide data processing rates higher than 10^18 bits/cm2/s while consuming 0.15uW. Technological challenges and fundamental physical limits of this approach are also discussed.