Magnetic Memory Device Exchange-Coupling Layer Stabilization

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Solution Overview

Problem

Magnetic memory devices face challenges in maintaining stable magnetization directions, leading to reduced reliability and increased interference between layers, which affects their performance in high-speed and low-power consumption applications.

Innovation Solution

Incorporating an exchange-coupling layer between sub-layers within the second vertical magnetic layer, along with diffusion barrier layers, to stabilize magnetization directions and minimize interference, resulting in a highly reliable magnetic memory device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If vertical magnetic layers are used for high-speed operation, then operation speed is improved, but magnetization stability deteriorates

Engineering Contradiction:

Improveoperation speedVSAvoidmagnetization stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

An exchange-coupling layer is introduced as an intermediary between the first and second vertical magnetic layers. This layer mediates the magnetic interaction between the layers, providing exchange coupling that stabilizes the magnetization directions while maintaining the vertical structure necessary for high-speed operation. The exchange-coupling layer acts as a buffer that enables stable magnetization without compromising the speed advantages of the vertical configuration.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If multiple magnetic layers are stacked to increase storage capacity, then memory capacity is improved, but mutual interference between layers increases

Engineering Contradiction:

Improvememory capacityVSAvoidmutual interference

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The exchange-coupling layer serves as a mediator between adjacent magnetic layers, controlling and regulating the magnetic interaction between them. By providing structured exchange coupling, it enables multiple layers to be stacked for increased capacity while minimizing harmful mutual interference through controlled magnetic field management.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The magnetic memory device employs a composite structure consisting of alternating ferromagnetic layers and non-magnetic spacer layers. This composite arrangement allows multiple magnetic layers to coexist with reduced interference, as the non-magnetic layers provide magnetic isolation while the overall structure maintains high storage capacity through vertical stacking.

Inventive Principle:

Principle #40Composite materials

3Reliability

If exchange-coupling layer is added to stabilize magnetization, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvemagnetization stabilityVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic memory device is segmented into distinct functional layers: first vertical magnetic layer, exchange-coupling layer, second vertical magnetic layer, and tunnel barrier layer. This segmentation allows each layer to perform its specific function independently, with the exchange-coupling layer dedicated to stabilization, thereby improving reliability without creating an unmanageably complex monolithic structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The exchange-coupling layer is positioned as an intermediary component between the magnetic layers, providing a focused and localized solution for magnetization stabilization. This approach adds complexity only where necessary (at the interface between magnetic layers) rather than throughout the entire device, thereby limiting the increase in overall device complexity.

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 solution effectively maintains stable magnetization directions, reducing mutual interference and enhancing the reliability of magnetic memory devices, thereby improving their performance in high-speed and low-power applications.

Implementation Method 1

an exchange-coupling layer between the first sub-layer and the second sub-layer

Methodology Applied

Scientific EffectExchange coupling: Magnetic Field

Implementation Method 2

An MTJ pattern may be formed by two (2) magnetic layers with a dielectric layer interposed therebetween and may have a different resistivity depending on the magnetization directions of the two magnetic layers

Methodology Applied

Scientific EffectMagnetic tunneling: Magnetoresistance

Implementation Method 3

a diffusion barrier layer between the second vertical magnetic layer and the second contact magnetic layer

Methodology Applied

Scientific EffectDiffusion barrier: Diffusion Barrier

Data Source

PatentUS9484529B2Magnetic memory device

Publication Date: 2016.11.01 SAMSUNG ELECTRONICS CO LTD

AI summary

A magnetic memory device is provided. The magnetic memory device includes a first vertical magnetic layer and a second vertical magnetic layer on a substrate, a tunnel barrier layer between the first vertical magnetic layer and the second vertical magnetic layer, and an exchange-coupling layer between a first sub-layer of the first vertical magnetic layer and a second sub-layer of the first vertical magnetic layer.