Magneto-Optical Memory Interface Using Photodiode Mediator
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Solution Overview
Problem
Conventional magneto-optical memory interfaces are limited by the wavelength or sub-wavelength of light, restricting the degree of memory integration and application potential.
Innovation Solution
A magneto-optical memory interface with a structure that includes multiple magnetic recording cells, a selection mechanism for individual cell selection, and a light irradiation system that changes magnetization states in response to optical and electrical signals, allowing for high-density, non-volatile storage without size restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional magneto-optical memory interface is used, then optical signals can be reflected to magnetization state, but memory cell size is limited to wavelength or sub-wavelength of light
Solution Approach 1:
The patent introduces a photodiode as an intermediary component between the optical waveguide and the magnetic tunnel junction. The photodiode converts optical signals to electrical signals, which then actuate the magnetization state change. This mediator enables the system to overcome the direct optical-to-magnetic coupling limitation, allowing memory cell sizes to exceed the optical wavelength while maintaining functionality.
Solution Approach 2:
The patent replaces the direct optical field interaction mechanism with an electrical signal-based mechanism. Instead of relying on direct optical reflection to change magnetization (which is wavelength-limited), the system uses photodiode-generated electrical signals to control the magnetic state, substituting optical mechanical interaction with electrical control.
2Reliability
If memory cell size is limited to wavelength or sub-wavelength, then optical signal reflection is effective, but application is limited
Solution Approach 1:
The photodiode serves as a mediator that maintains optical signal reflection efficiency while enabling broader applications. By converting optical signals to electrical signals, the system preserves the reliability of optical-to-magnetic coupling while removing the wavelength-size constraint, thereby expanding application possibilities.
Solution Approach 2:
The patent changes the operational parameter from direct optical field interaction to electrical signal control. This parameter change allows the system to maintain effective signal coupling (through the photodiode conversion process) while operating in a regime where memory cell size is not constrained by optical wavelength, thus expanding application range.
3Ease of operation
If photoelectric conversion element is used, then optical signal to electrical signal conversion is achieved, but device complexity increases
Solution Approach 1:
The photodiode is integrated into the memory cell structure to perform multiple functions: optical-to-electrical signal conversion, and participation in the magnetic switching process. This multi-functionality reduces overall device complexity by combining what would otherwise be separate components into a unified structure that achieves both signal conversion and memory operation.
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 high-density, non-volatile storage and reading of optical signals by controlling magnetization states using voltage, current, or thermal effects, facilitating high integration and simplified structure.
Implementation Method 1
a magneto-optical memory interface including: a memory cell structure having a plurality of magnetic recording cells allocated therein
Implementation Method 2
a method for selecting the magnetic recording cells by applying the electronic signal may be one of: reduction of magnetic anisotropy due to voltage effect using voltage signal; a spin-transfer-torque using current
Implementation Method 3
spin-orbit torque
Implementation Method 4
each of the magnetic recording cells is a magnetic recording cell whose sensitivity to changes in a magnetization state thereof increases in response to an irradiation light from the light irradiation part
Implementation Method 5
thermal reduction of magnetic anisotropy using current
Data Source
AI summary
A magneto-optical memory interface includes: a memory cell structure having multiple allocated magnetic recording cells, a selection means configured to select an individual or a predetermined number of the multiple allocated magnetic recording cells of the memory structure, and configured for an electronic signal to be applicable thereto; and a light irradiation part configured to irradiate the predetermined number of the multiple allocated magnetic memory cells with an optical signal, wherein each of the magnetic recording cells is a magnetic recording cell whose sensitivity to changes in a magnetization state thereof increases in response to an irradiation light from the light irradiation part, and each of the magnetic recording cells is a magnetic recording cell whose magnetization state changes in response to an applied electrical signal resulting from selection by the selection means and the irradiation light from the light irradiation part.