Spin Wave Computing using pre-recorded magnetization patterns

Abstract

We propose a novel type of a spin wave computing device, based on a bilayer structure which includes a bias layer, made from a hard magnetic material and a propagation layer, made from a magnetic material with low damping, for example, Yttrium Garnet (YiG) or Permalloy. The bias layer maintains a stable pre-recorded magnetization pattern, generating a bias field with a desired spatial dependence, which in turn sets the equilibrium magnetization inside the propagation layer. When an external source applies an RF field or spinwave to the propagation layer, excited spin waves scatter on the magnetization's inhomogenuities, resulting in a complex interference behavior. One thus has the ability to adjust spin wave propagation properties simply by altering the magnetization in the bias layer. We demonstrate that the phenomenon can be utilized to perform a variety of computational operations, including Fourier Transform, Vector-Matrix multiplication and Grover search algorithm, with the operational parameters exceeding conventional designs by orders of magnitude.

References in corpus (11)

• Realization of XNOR and NAND spin-wave logic gates
• Bit Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance
• Measurements of the exchange stiffness of YIG films by microwave resonance techniques
• Implementation of quantum search algorithm using classical Fourier optics
• High Spin-Wave Propagation Length Consistent with Low Damping in a Metallic Ferromagnet
• Spin-Wave Optical Elements: Towards Spin-Wave Fourier Optics
• Micromagnetic simulations of absoption spectra
• Template-Assisted Direct Growth of 1Td/in${}^2$ Bit Patterned Media
• Scattering of exchange spin waves from regions of modulated magnetization
• Classical search algorithm with resonances in $\sqrt{N}$ cycles
• Benchmarking Physical Performance of Neural Inference Circuits