Photonic Spin Register Using Domain-Wall Buffering for Fast Photoelectric I/O
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Solution Overview
Problem
The speed gap between optical signals and electrical signals in current photonic systems hinders the achievement of high-speed and low-power photoelectric interfaces.
Innovation Solution
A photonic spin register is introduced, which includes a shift register unit with a magnetic material layer and a write unit that uses a photocurrent or optical signal to write spin information into the magnetic domain, allowing for high-speed and low-power data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an amplifier is used to amplify photocurrent and convert it to voltage, then the output voltage is sufficient, but power consumption increases
Solution Approach 1:
The patent replaces the electrical amplifier-based photoelectric conversion system with a spintronic system that uses spin-polarized current to directly switch magnetic domains. This substitution eliminates the need for voltage amplification and achieves high-speed photoelectric conversion through magnetic domain switching driven by spin current, thereby reducing power consumption while maintaining sufficient output signal levels.
Solution Approach 2:
The patent changes the fundamental operating parameter from voltage amplification to magnetic domain switching. By using spin-polarized current to switch magnetic domains in a magnetic material layer, the system achieves photoelectric conversion through magnetic state changes rather than electrical voltage amplification, resulting in lower power consumption and higher speed operation.
2Use of energy by moving object
If a load resistor is used instead of amplifier, then power consumption is reduced, but the RC time constant increases and operation speed is limited to several tens of GHz
Solution Approach 1:
The patent replaces the resistor-based photoelectric conversion system with a spintronic system using magnetic domain switching. This substitution eliminates the RC time constant limitation by using magnetic domain wall motion and spin current, enabling operation speeds exceeding 100 GHz while maintaining low power consumption characteristics.
Solution Approach 2:
The patent changes the limiting parameter from RC time constant to magnetic domain switching speed. By utilizing spin-polarized current to switch magnetic domains in a magnetic material layer, the system achieves faster operation speeds beyond the limitations of resistive circuits, reaching into the hundreds of GHz range.
3Reliability
If conventional photoelectric conversion is used, then electrical signal output is achieved, but the speed gap between optical and electrical signals remains
Solution Approach 1:
The patent replaces conventional electrical photoelectric conversion with spintronic photoelectric conversion using magnetic domain switching. This substitution bridges the speed gap by using spin current to directly switch magnetic domains, achieving photoelectric conversion speeds that match optical signal speeds and eliminating the two-order-of-magnitude speed gap between optical and electrical domains.
Solution Approach 2:
The patent changes the conversion mechanism parameter from electrical voltage/current amplification to magnetic domain switching. By using spin-polarized current to switch magnetic domains in a magnetic material layer, the system achieves photoelectric conversion speeds comparable to optical signal speeds, thereby bridging the speed gap between optical and electrical signal domains.
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
The photonic spin register enables high-speed data transfer with reduced power consumption by effectively bridging the speed gap between optical and electrical signals through spintronics-based data processing.
Implementation Method 1
a photodetector configured to receive an optical signal that is a pulse amplitude-modulated and serial input signal and convert the optical signal into a photocurrent
Implementation Method 2
the write unit is configured to write spin information into a magnetic domain in the magnetic material layer of each of the plurality of shift register units by transferring information included in the optical signal to a spin state of the magnetic domain in the magnetic material layer due to a spin Hall effect
Implementation Method 3
when a plurality of pulsed currents based on pieces of input information flow in parallel through the plurality of spin Hall materials, respectively, spin-orbit torques are induced to allow a plurality of pieces of spin information to be written into the magnetic material layer
Implementation Method 4
the plurality of pieces of spin information to move and be read out in series as an electrical signal via the read element by a magnetoresistance effect
Data Source
AI summary
A photonic spin register includes: a shift register unit including a magnetic material layer having a shape extending in one direction; and a write unit configured to write spin information into a magnetic domain in the magnetic material layer by transferring information included in an optical signal that is a pulse amplitude-modulated and serial input signal, to a spin state of the magnetic domain in the magnetic material layer by means of a photocurrent corresponding to the optical signal or by irradiation with the optical signal. When a shift current flows through the shift register unit in the one direction, a domain wall is configured to move in the magnetic material layer, thereby allowing the spin information to move and be buffered in the magnetic material layer.