System and method for applying a magnonic matrix-vector-multiplier arrangement

Patent metadata

Field	Value
Publication number	US-11599138-B2
Application number	US-201916593917-A
Country	US
Kind code	B2
Filing date	Oct 4, 2019
Priority date	Oct 5, 2018
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

An arrangement for use in a matrix-vector-multiplier, comprising a stack of material layers arranged on a substrate, and a waveguide element formed in at least one material layer in the stack is disclosed. In one aspect, the arrangement further comprises a transducer arrangement which is coupled to the waveguide element. The transducer arrangement is configured to generate and detect spin wave(s) in the waveguide element, and wherein the waveguide element is configured to confine and to provide interference of the at spin wave(s) propagating therein. The arrangement further comprises a control mechanism comprising at least one control element coupled to the waveguide element, and a direct current electric source coupled to the at least one control element. The control mechanism, via the at least one control element, is configured to modify the phase velocity of the spin wave(s) propagating in the waveguide element.

First claim

What is claimed is:

1. An apparatus for use in a matrix-vector-multiplier, MVM, wherein the apparatus comprises:
a stack of material layers arranged on a substrate;
a waveguide element formed in at least one material layer in the stack;
a transducer coupled to the waveguide element and configured to generate and detect at least one spin wave in the waveguide element, wherein the waveguide element is configured to confine and to provide interference of the at least one spin wave propagating therein;
a control mechanism formed in at least one material layer in the stack, wherein the control mechanism comprises:
at least one control element coupled to the waveguide element, and
a direct current electric source coupled to the at least one control element,

wherein the control mechanism, via the at least one control element, is configured to modify a phase velocity of the at least one spin wave propagating in the waveguide element.

2. The apparatus of claim 1 , wherein the waveguide element comprises a magnetic material.

3. The apparatus of claim 1 , wherein the waveguide element comprises a ferrimagnetic yttrium iron garnet, YIG.

4. The apparatus of claim 1 , wherein the at least one control element comprises at least one antenna.

5. The apparatus of claim 1 , wherein the at least one control element comprises at least one magnetoelectric cell.

6. The apparatus of claim 5 , wherein the at least one magnetoelectric cell comprises at least one piezoelectric element.

7. The apparatus of claim 1 , wherein the transducer comprises at least one input for generating at least one spin wave in the waveguide element and at least one output for detecting at least one spin wave propagating in the waveguide element.

8. The apparatus of claim 7 , wherein the at least one input comprises:
an input electrode;
a deformation element coupled to the electrode; and
a magnetostrictive element coupled to the deformation element,
wherein a change in physical dimensions of the deformation element in response to an electrical actuation via the input electrode results in a mechanical stress in the magnetostrictive element, which results in a change in magnetization of the magnetostrictive element and in a generation of a spin wave in the waveguide element.

9. The apparatus of claim 7 , wherein the at least one output comprises:
an output electrode;
a deformation element coupled to the electrode; and
a magnetostrictive element coupled to the deformation element,
wherein the at least one propagating spin wave results in the change of magnetization of the magnetostrictive element, which results in a mechanical stress in the magnetostrictive element and results in a change in physical dimensions of the deformation element and in an electrical actuation in the output electrode.

10. A matrix-vector-multiplier, MVM, apparatus, comprising:
the apparatus for use in the MVM of claim 1 ;
at least one input layer configured to input at least one input signal into the MVM arrangement;
at least one output layer configured to output at least one output signal from the MVM arrangement;
at least one intermediate layer arranged between the at least one input layer and the at least one output layer, wherein the at least one intermediate layer is coupled to the at least one input layer and the at least one output layer via at least one connection associated with a weight as a function of a phase velocity of at least one spin wave, W(v), propagating in the waveguide element of the arrangement,
wherein the at least one intermediate layer is further coupled to the at least one control element,
and wherein the control mechanism, via the at least one control element, is configured to control the respective weight of the at least one connection by modifying the phase velocity of the at least one spin wave propagating in the waveguide element.

11. A method for training a matrix-vector-multiplier, MVM, arrangement, comprising:
providing the MVM arrangement of claim 10 ;
via the transducer of the MVM arrangement, generating and providing interference of at least one spin wave in the waveguide element,
applying, via the direct current electric source and the at least one control element of the control mechanism, a direct current, DC, signal for controlling the respective weight of the at least one connection by modifying the phase velocity of the at least one spin wave propagating in the waveguide element.

12. The method of claim 11 , further comprising applying an electric field over the at least one element of 1-20 MV/m, preferably 5-15 MV/m, and even more preferred 7.5-12.5 MV/m.

13. The method of claim 11 , further comprising applying the direct current, DC, signal during 0.75-1.25 ms.

14. A method for using a matrix-vector-multiplier, MVM, arrangement, comprising:
providing an MVM arrangement comprising:
a stack of material layers arranged on a substrate;
a waveguide element formed in at least one material layer in the stack;
a transducer coupled to the waveguide element and configured to generate and detect at least one spin wave in the waveguide element, wherein the waveguide element is configured to confine and to provide interference of the at least one spin wave propagating therein;
a control mechanism formed in at least one material layer in the stack, wherein the control mechanism comprises:
at least one control element coupled to the waveguide element, and
a direct current electric source coupled to the at least one control element,

wherein the control mechanism, via the at least one control element, is configured to modify a phase velocity of the at least one spin wave propagating in the waveguide element;

performing the method for training the MVM arrangement of claim 11 ;
providing at least one input signal into the MVM arrangement via the at least one input layer; and
receiving at least one output signal from the MVM arrangement via the at least one output layer.

15. An artificial neural network, comprising the MVM apparatus of claim 10 .

Assignees

• Imec Vzw
• Univ Leuven Kath

Inventors

• Adelmann Hanns Christoph
• Costa Jose Diogo
• Ciubotaru Florin

Classifications

• G06E1/045 Primary

  Matrix or vector computation · CPC title

• G06N3/084 Primary

  Backpropagation, e.g. using gradient descent · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• G06N3/065

  Analogue means · CPC title