Pattern Recognition with Magnonic Holographic Memory Device

TL;DR

This paper demonstrates the use of magnonic holographic devices for pattern recognition, showing experimental results that reveal unique output signatures for specific input phase patterns, with potential advantages over optical holography.

Contribution

The work introduces experimental data on magnonic holographic devices for pattern recognition, highlighting their unique signatures and potential for higher storage density compared to optical holography.

Findings

Unique output signatures for specific input phases

Potential for higher storage density due to shorter wavelength

Compatibility with conventional electronic devices

Abstract

In this work, we present experimental data demonstrating the possibility of using magnonic holographic devices for pattern recognition. The prototype eight-terminal device consists of a magnetic matrix with micro-antennas placed on the periphery of the matrix to excite and detect spin waves. The principle of operation is based on the effect of spin wave interference, which is similar to the operation of optical holographic devices. Input information is encoded in the phases of the spin waves generated on the several edges of the magnonic matrix, while the output corresponds to the amplitude of the inductive voltage produced by the interfering spin waves on the other side of the matrix. The level of the output voltage depends on the combination of the input phases as well as on the internal structure of the magnonic matrix. Experimental data collected for several magnonic matrixes show the unique output signatures in which maxima and minima correspond to specific input phase patterns. Potentially, magnonic holographic devices may provide a higher storage density compare to the optical counterparts due to a shorter wavelength and compatibility with conventional electronic devices. The challenges and shortcoming of the magnonic holographic devices are also discussed.