Spin Wave Transducer Using Magnetic Film Wavelength Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in fabricating microwave devices at the chip-scale due to the difficulty in launching short-wavelength spin waves and integrating yttrium iron garnet with silicon, leading to energy loss and practicality issues.
Innovation Solution
A device comprising a gadolinium gallium garnet base substrate with a transducer having a first magnetic film and metal strips, coupled with a yttrium iron garnet magnetic film, efficiently converts long-wavelength spin waves into ultra-small-wavelength spin waves by adjusting the spin-wave phase velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If direct launching of short-wavelength spin waves is attempted using conventional transducers, then the desired small wavelength is achieved, but the device complexity and fabrication difficulty increase significantly
Solution Approach 1:
The patent introduces a first magnetic film as an intermediary medium between the conventional transducer and the second magnetic film. This intermediary allows the system to use a simple, large-waveguide transducer that generates long-wavelength spin waves in the first magnetic film, which then convert to short-wavelength spin waves in the second magnetic film through the wavelength conversion mechanism, avoiding the need to fabricate complex nanoscale transducers directly.
Solution Approach 2:
The patent adds a dimensional aspect by using two different magnetic films with different magnetic saturation values arranged in sequence. This creates a spatial dimension for wavelength conversion, where the spin wave wavelength changes as it propagates from the first magnetic film to the second magnetic film, enabling short-wavelength generation without requiring the transducer itself to be at the nanoscale.
2Reliability
If yttrium iron garnet is integrated with silicon for spin wave devices, then the desired magnetic properties are achieved, but energy loss increases due to integration challenges
Solution Approach 1:
The patent changes the magnetic saturation parameter by selecting a first magnetic film with a higher magnetic saturation value than the second magnetic film (yttrium iron garnet). This parameter change enables efficient wavelength conversion while reducing the integration challenges and energy loss associated with directly integrating yttrium iron garnet with silicon, as the first magnetic film serves as a buffer that eases the integration process.
3Ease of manufacture
If conventional transducers with large waveguides are used, then ease of manufacture is improved, but the ability to generate short-wavelength spin waves deteriorates
Solution Approach 1:
The patent performs a preliminary action by generating long-wavelength spin waves in the first magnetic film using a conventional, easy-to-manufacture transducer with a large waveguide. This preliminary spin wave generation is followed by wavelength conversion in the second magnetic film, which transforms the long-wavelength spin waves into short-wavelength spin waves, thus achieving the desired short wavelength without requiring the transducer itself to be fabricated at nanoscale dimensions.
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
Enables the fabrication of smaller microwave devices with reduced energy loss by converting long-wavelength spin waves into ultra-small-wavelength spin waves, suitable for integration into silicon microchips for various electronic applications.
Implementation Method 1
The plurality of metal strips are configured to receive a first signal, such that the first signal excites a first spin wave in the first magnetic film
Implementation Method 2
the second magnetic film having a spin-wave phase velocity lower than the first magnetic film. The second magnetic film is configured to produce a second spin wave having a wavelength shorter than the first spin wave
Data Source
AI summary
A device that produces spin waves includes a base substrate, a transducer that includes a first plane defined by a first magnetic film and a second plane defined by a plurality of metal strips, and a second magnetic film having a spin-wave phase velocity lower than the first magnetic film. The second magnetic film is adjacent to the first magnetic film, and the first plane and the second plane are parallel. The plurality of metal strips are configured to receive a first signal, such that the first signal excites a first spin wave in the first magnetic film. The second magnetic film is configured to produce a second spin wave having a wavelength shorter than the first spin wave.