Magnetic Oscillator with Segmented Insulating Layer

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Solution Overview

Problem

Conventional magnetic oscillators face challenges in achieving a balance between high Q-factor stability and high output power, with GMR oscillators offering high Q-factors but low power output, and TMR oscillators providing high power but low Q-factors, due to limitations in current flow and insulation breakdown.

Innovation Solution

A magnetic oscillator design featuring a layered structure with a first and second ferromagnetic layer separated by an insulating layer, where regions with different resistance area products are used to enhance current density and magnetization oscillation, allowing for high Q-factor and high output power generation by optimizing the current flow through regions with varying resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a TMR oscillator structure is used to increase current density and output power, then power output is improved, but insulation breakdown occurs and Q-factor deteriorates

Engineering Contradiction:

Improveoutput powerVSAvoidinsulation stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The device is divided into multiple magnetic layers (first ferromagnetic layer, second ferromagnetic layer, third ferromagnetic layer) with insulating layers in between, allowing current to flow through multiple paths while maintaining insulation integrity. This segmentation enables high current density without single-point insulation breakdown.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the device have different resistance area products (RA products), creating local variations in current density. The region with lower RA product experiences higher current density, enhancing magnetization oscillation and output power, while other regions maintain insulation stability.

Inventive Principle:

Principle #3Local quality

2Reliability

If GMR oscillator structure is used with high current flow, then Q-factor is improved, but output power remains low

Engineering Contradiction:

Improveoscillation stabilityVSAvoidoutput power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The device combines TMR and GMR effects in a single structure, utilizing both tunnel magnetoresistance and giant magnetoresistance. This composite approach leverages the high Q-factor of GMR oscillators while achieving the high output power of TMR oscillators through the insulating layer configuration.

Inventive Principle:

Principle #40Composite materials

3Power

If current density is increased to enhance magnetization oscillation, then output power is improved, but insulation breakdown occurs

Engineering Contradiction:

Improveoutput powerVSAvoidinsulation breakdown

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The insulating layer is positioned between multiple ferromagnetic layers, segmenting the current path into multiple smaller segments. This distribution prevents concentrated current stress on a single insulating interface, enabling sustained high current density operation without insulation breakdown.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulating layer acts as an intermediary between the first and second ferromagnetic layers, mediating the current flow. It allows sufficient current to pass for high output power while maintaining electrical insulation, preventing direct contact and breakdown between ferromagnetic layers.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design achieves a high Q-factor and high output power by ensuring a large current density in specific regions, overcoming the limitations of previous oscillators and enabling efficient magnetization oscillation and power output.

Implementation Method 1

the magnetization in the magnetization free layer is oscillated by a spin transfer effect between the magnetization free layer and the magnetization pinned layer

Methodology Applied

Scientific EffectSpin transfer effect:

Implementation Method 2

the element resistance changes from moment to moment mainly by magnetoresistive effect, and therefore an alternating-current component of the voltage is produced

Methodology Applied

Scientific EffectMagnetoresistive effect: Magnetoresistance

Data Source

PatentUS8982514B2Magnetic oscillator

Publication Date: 2015.03.17 KK TOSHIBA

AI summary

According to one embodiment, a magnetic oscillator includes a layered film and a pair of electrodes. The layered film includes a first ferromagnetic layer, an insulating layer stacked on the first ferromagnetic layer, and a second ferromagnetic layer stacked on the insulating layer. The pair of electrodes is configured to apply a current to the layered film in a direction perpendicular to a film surface of the layered film. Regions having different resistance area products are provided between the first ferromagnetic layer and the second ferromagnetic layer.