Spin Hall Oscillator Coupling Tunability

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Solution Overview

Problem

Existing on-chip embedded oscillators, such as spin torque oscillators, face challenges with high operating power requirements, reliability issues due to high tunneling current, and the need for external magnetic bias, which increases costs and introduces noise in signal processing.

Innovation Solution

The development of self-sustained Spin Hall Oscillators (SHOs) that operate without external magnetic bias, utilizing spin current from a Spin Hall Effect material to produce magnetic oscillations, and employing a coupling circuit for tunable and efficient coupling between oscillators, reducing power consumption and eliminating the need for external biasing circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If tunnel junction based MTJ is used for spin torque oscillator, then oscillation can be achieved, but operating power requirement increases due to large bias current and voltage

Engineering Contradiction:

Improveoperating powerVSAvoidreliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent changes the fundamental operating parameters by transitioning from parallel magnetization configuration to perpendicular magnetization configuration in the magnetic tunnel junction. This parameter change enables the use of spin hall effect materials with perpendicular magnetic anisotropy, which operate at lower currents and voltages while maintaining oscillation functionality, thereby reducing power consumption and improving reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional spin torque mechanism requiring external magnetic fields with a spin hall effect mechanism that uses spin current from a heavy metal layer. This substitution eliminates the need for external magnetic bias circuits, reducing both power consumption and device complexity while maintaining oscillator functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If external magnetic bias is applied to make STO oscillate, then oscillation is achieved, but additional cost is incurred and noise is introduced in signals

Engineering Contradiction:

Improvedevice complexityVSAvoidnoise

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the external magnetic bias component from the oscillator system. By using spin hall effect materials with perpendicular magnetic anisotropy, the oscillator can be self-sustained without external magnetic fields, thereby eliminating the associated circuits, costs, and noise interference in signal processing

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent enables the oscillator to be self-sustained by utilizing the spin hall effect within the magnetic tunnel junction structure itself. The perpendicular magnetization configuration allows the system to generate and maintain oscillations through internal spin current mechanisms without requiring external magnetic bias, making the device self-service and eliminating noise from external bias circuits

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If conventional coupling mechanism is used between oscillators, then coupling is achieved, but coupling strength cannot be tuned efficiently

Engineering Contradiction:

Improvecoupling tunabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent introduces dynamic tunability to the coupling mechanism by using magnetic field controllable elements that can adjust the coupling strength between oscillators. This dynamic capability allows the coupling to be tuned efficiently across different operating conditions while maintaining a relatively simple device structure, achieving adaptability without proportionally increasing complexity

Inventive Principle:

Principle #15Dynamics

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

SHOs achieve low power consumption, reduced area requirements, and improved reliability by generating oscillations independently of external magnetic fields, enabling efficient integration into chips and enabling ultra-small RF circuitry for devices like smartphones and tablets, with tunable oscillation frequencies and efficient coupling mechanisms.

Implementation Method 1

utilizing spin current from a Spin Hall Effect material to produce magnetic oscillations

Methodology Applied

Scientific EffectSpin Hall Effect: Hall Effect

Data Source

PatentUS10320404B2Coupled spin hall nano oscillators with tunable strength

Publication Date: 2019.06.11 TAHOE RES LTD

AI summary

Described is an oscillating apparatus which comprises: an interconnect with spin-coupling material (e.g., Spin Hall Effect (SHE) material); and a magnetic stack having two magnetic layers such that one of the magnetic layers is coupled to the interconnect, wherein each of the two magnetic layers have respective magnetization directions to cause the magnetic stack to oscillate.