Spin Wave Element Ellipsoidal Edge Focusing
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Solution Overview
Problem
Spin waves propagating as spherical waves in spin wave elements make it difficult to detect them effectively due to dispersion and rapid attenuation, as opposed to plane waves, which are easier to focus and detect.
Innovation Solution
The spin wave element is designed with a multilayer structure where the ferromagnetic layer has a magnetization direction perpendicular to the plane and an ellipsoidal outer edge, allowing spin waves to be reflected and focused onto a detecting portion without additional components, enhancing detection efficiency and amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spin waves propagate as spherical waves in the ferromagnetic layer, then the spin wave can be generated by passing current into the input portions, but the spin wave spreads spherically making it difficult to detect at the detecting portion
Solution Approach 1:
The ferromagnetic layer is designed with an ellipsoidal shape where the outer edge forms an ellipsoid when viewed from the lamination direction. This curved geometry causes spherical spin waves to reflect and focus at specific points on the ellipsoid, converting the problematic spherical propagation into focused wave patterns that can be effectively detected at the detecting portion located on the major axis of the ellipsoid.
Solution Approach 2:
The invention changes the geometric parameters of the ferromagnetic layer by forming it with a specific ellipsoidal outer edge configuration. This parameter change in the layer's shape modifies the spin wave propagation characteristics, causing spherical waves to focus rather than disperse, thereby improving detection capability without changing the spin wave generation mechanism.
2Measurement precision
If the spin wave propagates as a plane wave, then it is easier to focus and detect, but additional components would be required to convert spherical waves to plane waves
Solution Approach 1:
The ferromagnetic layer itself serves the dual function of both spin wave generation and focusing. By designing the layer with an ellipsoidal outer edge, the structure automatically focuses spherical spin waves without requiring additional external components such as lenses or waveguides. The layer's geometry performs the focusing function inherently, simplifying the overall device structure.
Solution Approach 2:
The ferromagnetic layer is designed to perform multiple functions: it generates spin waves when current is applied to input portions, and simultaneously focuses these spherical spin waves through its ellipsoidal geometry to enable detection. This multi-functional design eliminates the need for separate components for wave generation and focusing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables efficient detection of spin waves by focusing spherical waves onto a single point, overcoming the challenges of rapid attenuation and dispersion, and achieving higher amplitudes compared to plane waves.
Implementation Method 1
generates spin waves in the ferromagnetic layer with the same phase or different phase by passing a current into the input portions
Implementation Method 2
the spin wave propagates as a spherical wave... the spin wave will spread spherically to make it difficult to detect the spin wave at the detecting portion
Data Source
AI summary
A spin wave element includes a substrate, a multilayer, a detecting portion, and two or more input portions. The multilayer having a lamination direction thereof is formed on the substrate and includes a first ferromagnetic layer. The first ferromagnetic layer has magnetization whose direction is in the lamination direction. The detecting portion and the input portions are formed on the multilayer and separated from each other by a first nonmagnetic layer. In addition, a portion of an outer edge of the multilayer viewed from the lamination direction makes a portion of one ellipsoid. The detecting portion and one of the input portions are located on the long axis of the one ellipsoid. The portion of the one ellipsoid is located on a side of one of the input portions.