Magnetic Correction Layer for MTJ Thermal Stability

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Solution Overview

Problem

Current memory devices face challenges in achieving improved switching characteristics and thermal stability for variable resistance elements, which are crucial for efficient data storage in miniaturized electronic devices with low power consumption and high performance.

Innovation Solution

The implementation of a semiconductor memory device with a magnetic tunnel junction (MTJ) structure, including a free layer with a variable magnetization direction, a pinned layer, a tunnel barrier layer, an exchange coupling layer, and a magnetic correction layer with a specific stack configuration of magnetic layers, which enhances thermal stability and switching performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional magnetic tunnel junction structure is used, then the device structure is simple, but the switching characteristics and thermal stability are insufficient

Engineering Contradiction:

Improvethermal stabilityVSAvoidmagnetic layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The magnetic correction layer is divided into multiple magnetic layers (first magnetic layer, second magnetic layer, third magnetic layer) with different saturation magnetizations. This segmentation allows each layer to contribute differently to the overall magnetic stability, with the first layer providing strong pinning and the subsequent layers providing gradual transition, thereby improving thermal stability while managing structural complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different magnetic layers are assigned different saturation magnetization values to create local quality variations. The first magnetic layer has high saturation magnetization for strong magnetic pinning, while the second and third layers have progressively lower saturation magnetizations to provide a gradient structure that enhances switching characteristics and thermal stability

Inventive Principle:

Principle #3Local quality

2Reliability

If a conventional magnetic tunnel junction structure is used, then the manufacturing process is simple, but the switching characteristics are insufficient

Engineering Contradiction:

Improveswitching characteristicsVSAvoidmagnetic layer fabrication

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The magnetic correction layer is segmented into multiple layers with progressively decreasing saturation magnetization. This segmentation creates a gradient structure that improves switching characteristics by providing a more controlled magnetic field distribution during switching operations, while the systematic layering approach maintains manufacturing feasibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The saturation magnetization parameter is systematically changed across different magnetic layers. By varying the saturation magnetization from the first layer to the second and third layers, the invention optimizes switching characteristics through parameter gradient design, allowing for improved performance while following established magnetic layer fabrication processes

Inventive Principle:

Principle #35Parameter changes

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

This configuration improves the switching characteristics and thermal stability of the variable resistance element, leading to enhanced performance and reliability in semiconductor memory devices, suitable for various electronic devices and systems.

Implementation Method 1

an exchange coupling layer formed over the pinned layer; and a magnetic correction layer formed over the exchange coupling layer

Methodology Applied

Scientific EffectExchange coupling:

Implementation Method 2

the first magnetic layer has a saturation magnetization smaller than a saturation magnetization of the second magnetic layer

Methodology Applied

Scientific EffectMagnetic anisotropy:

Implementation Method 3

a tunnel barrier layer formed over the free layer

Methodology Applied

Scientific EffectQuantum tunneling:

Implementation Method 4

the magnetic correction layer comprises a first magnetic layer, a spacer layer and a second magnetic layer that are sequentially stacked, and the first magnetic layer has a saturation magnetization smaller than a saturation magnetization of the second magnetic layer

Methodology Applied

Scientific EffectSaturation magnetization gradient:

Data Source

PatentUS9865320B2Electronic device

Publication Date: 2018.01.09 SK HYNIX INC

AI summary

This technology provides an electronic device. An electronic device in accordance with an implementation of this document may include a semiconductor memory, and the semiconductor memory may include free layer having a variable magnetization direction; a tunnel barrier layer formed over the free layer; a pinned layer formed over the tunnel barrier layer and having a pinned magnetization direction; an exchange coupling layer formed over the pinned layer; and a magnetic correction layer formed over the exchange coupling layer, wherein the magnetic correction layer comprises a first magnetic layer, a spacer layer and a second magnetic layer that are sequentially stacked, and the first magnetic layer has a saturation magnetization smaller than a saturation magnetization of the second magnetic layer.