Semiconductor Memory Device with Polarization Enhancement and Intervening Pattern
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Solution Overview
Problem
Current semiconductor memory devices face challenges in improving electrical characteristics, particularly in achieving high-density, low-power, and non-volatile memory solutions for portable devices, where magnetic tunnel junction patterns with tunnel magnetoresistance (TMR) effects are used but require enhancements for better performance.
Innovation Solution
A semiconductor memory device design incorporating a free magnetic pattern, a reference magnetic pattern with a synthetic anti-ferromagnetic structure, a tunnel barrier pattern, a polarization enhancement magnetic pattern, and an intervening pattern, with specific layering and material configurations to optimize magnetic moments and anisotropy, including ferromagnetic and non-magnetic layers alternately stacked to enhance tunneling magnetoresistance ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic tunnel junction patterns are used for data storage, then non-volatile memory capability is achieved, but electrical characteristics and switching performance need improvement
Solution Approach 1:
An intervening pattern is introduced between the polarization enhancement magnetic pattern and the first pinned pattern to mediate magnetic field interactions. This intermediary layer minimizes stray magnetic fields generated by the magnetic tunnel junction structure while maintaining the non-volatile memory capability through controlled magnetic moment orientation.
Solution Approach 2:
The patent modifies magnetic moment parameters by configuring the polarization enhancement magnetic pattern with a magnetic moment larger than the first pinned pattern, and orienting it substantially perpendicular to the interface. This parameter change reduces stray magnetic fields while preserving data storage functionality.
2Reliability
If ferromagnetic and non-magnetic layers are alternately stacked to enhance TMR, then tunneling magnetoresistance ratio is improved, but device structure becomes more complex
Solution Approach 1:
The reference magnetic pattern is segmented into multiple functional components: first pinned pattern, second pinned pattern, and exchange coupling pattern between them. Each segment serves a specific function in enhancing TMR through alternating ferromagnetic and non-magnetic layers, while the modular segmentation allows for optimized magnetic moment control.
Solution Approach 2:
The patent employs composite structures with alternating ferromagnetic and non-magnetic layers in both pinned patterns. The first pinned pattern uses first ferromagnetic and first non-magnetic layers, while the second pinned pattern uses second ferromagnetic and second non-magnetic layers with different materials, creating a composite structure that enhances tunneling magnetoresistance ratio through controlled magnetic anisotropy.
3Ease of operation
If polarization enhancement magnetic pattern is added to reduce stray fields, then switching characteristics are improved, but manufacturing process becomes more difficult
Solution Approach 1:
The polarization enhancement magnetic pattern is positioned locally between the tunnel barrier pattern and the first pinned pattern, with its magnetic moment oriented substantially perpendicular to the interface. This localized configuration improves switching characteristics by enhancing magnetic polarization at the critical tunnel barrier interface without requiring global structural modifications.
Solution Approach 2:
The intervening pattern is deposited preliminarily between the polarization enhancement magnetic pattern and the first pinned pattern before final magnetic moment orientation is established. This preliminary structural preparation facilitates subsequent manufacturing steps by pre-establishing the spatial relationships and magnetic coupling pathways needed for optimal switching performance.
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 proposed design improves electrical characteristics by minimizing stray magnetic fields, reducing switching field distributions, and enhancing switching characteristics, leading to improved performance and reliability in semiconductor memory devices.
Implementation Method 1
a tunnel barrier pattern between the reference magnetic pattern and the free magnetic pattern
Implementation Method 2
an exchange coupling pattern between the first and second pinned patterns
Data Source
AI summary
A semiconductor memory device includes free magnetic pattern on a substrate, a reference magnetic pattern on the free magnetic pattern, the reference magnetic pattern including a first pinned pattern, a second pinned pattern, and an exchange coupling pattern between the first and second pinned patterns, a tunnel barrier pattern between the reference magnetic pattern and the free magnetic pattern, a polarization enhancement magnetic pattern between the tunnel barrier pattern and the first pinned pattern, and an intervening pattern between the polarization enhancement magnetic pattern and the first pinned pattern, wherein the first pinned pattern includes first ferromagnetic patterns and anti-ferromagnetic exchange coupling patterns which are alternately stacked.