Magnetic Tunneling Junction Oxide Layer for Diffusion-Stable Switching

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Solution Overview

Problem

Existing magnetic tunneling junction devices face challenges in maintaining low resistance and high durability while achieving fast operation speeds due to issues with oxygen and nitrogen diffusion affecting the free layer, leading to increased resistance and decreased switching efficiency.

Innovation Solution

The implementation of a first oxide layer with a stoichiometrically oxygen-deficient composition and a second magnetic layer doped with metal elements, along with cryogenic cooling and controlled annealing processes, traps oxygen and nitrogen atoms in the oxide layer, preventing their diffusion into the free layer, thereby maintaining low saturation magnetization and improving operation speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional magnetic tunneling junction devices are used, then data storage functionality is achieved, but oxygen and nitrogen diffusion into the free layer increases resistance and decreases switching efficiency

Engineering Contradiction:

Improveswitching efficiencyVSAvoidoxygen and nitrogen diffusion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An oxide layer with oxygen-deficient composition is introduced as an intermediary between the capping layer and the free layer. This oxide layer acts as a trap for oxygen and nitrogen atoms, preventing them from diffusing into the free layer. The oxide layer absorbs harmful atoms through its oxygen-deficient sites, thereby protecting the free layer and maintaining low resistance and high switching efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If operation speed is increased, then data processing capability improves, but resistance fluctuations increase and stability decreases

Engineering Contradiction:

Improveoperation speedVSAvoidresistance stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The oxide layer with oxygen-deficient composition converts the harmful effect of oxygen diffusion into a beneficial trap mechanism. By intentionally creating oxygen vacancies in the oxide layer, these vacancies serve as traps for oxygen and nitrogen atoms that would otherwise diffuse into the free layer and cause resistance fluctuations. This transforms the potential harm of oxygen presence into a protective mechanism that stabilizes resistance while enabling fast operation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If the free layer is doped with metal elements to improve performance, then saturation magnetization control improves, but susceptibility to oxygen diffusion increases

Engineering Contradiction:

Improvesaturation magnetization controlVSAvoidoxygen diffusion susceptibility

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The oxide layer serves as a protective intermediary between the doped free layer and the capping layer. Metal element doping in the free layer (such as Co, Fe, Ni) improves saturation magnetization control, but these doped layers are more susceptible to oxygen diffusion. The oxide layer with oxygen-deficient composition positioned adjacent to the free layer traps oxygen and nitrogen atoms before they can reach and degrade the doped free layer, thereby protecting the carefully controlled magnetic properties.

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

This approach enhances the stability and operation speed of the magnetic tunneling junction device by reducing resistance fluctuations and maintaining perpendicular magnetic anisotropy, thus improving the performance of memory devices like STT-MRAM.

Implementation Method 1

traps oxygen and nitrogen atoms in the oxide layer, preventing their diffusion into the free layer

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 2

cryogenic cooling and controlled annealing processes

Methodology Applied

Scientific EffectCryogenic cooling: Cryogenics

Implementation Method 3

cryogenic cooling and controlled annealing processes

Methodology Applied

Scientific EffectAnnealing: Annealing

Data Source

PatentUS12610747B2Magnetic tunneling junction device, memory device including the same, and method of manufacturing the magnetic tunneling junction device

Publication Date: 2026.04.21 SAMSUNG ELECTRONICS CO LTD

AI summary

Provided are magnetic tunneling junction devices, memory devices including the magnetic tunneling junction devices, and methods of manufacturing the magnetic tunneling junction devices. The magnetic tunneling junction device includes a first magnetic layer; a second magnetic layer disposed to face the first magnetic layer; and a first oxide layer disposed between the first magnetic layer and the second magnetic layer and including a metal oxide, wherein the metal oxide of the first oxide layer has a stoichiometrically oxygen-deficient composition, and wherein the second magnetic layer includes a magnetic material doped with a metal element.