Amorphous Soft Magnetic Memory Tracks for High-Density Data Storage
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Solution Overview
Problem
Conventional magnetic random access memory (MRAM) devices based on the GMR effect have limited data storage capacity due to small resistance differences, which restricts the achievement of large voltage differences and require larger metal oxide semiconductor field effect transistors, while those based on TMR layers are being researched for improved data storage capabilities.
Innovation Solution
A magnetic memory device utilizing an amorphous soft magnetic material with a higher magnetic anisotropy constant, such as NiFeSiB, to form memory tracks that allow for multiple data bits per cell by switching magnetization directions using input signals, enabling efficient data storage and retrieval through magnetic domain motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional MRAM based on GMR effect is used, then device structure is simple, but data storage capacity is limited due to small resistance difference
Solution Approach 1:
The patent changes the material parameter from conventional GMR layers to amorphous soft magnetic materials with high magnetic anisotropy constants (e.g., NiFeSiB), which fundamentally alters the resistance characteristics and enables multiple data bits per cell through enhanced magnetic domain control
Solution Approach 2:
The patent employs composite material structures combining amorphous soft magnetic materials with high magnetic anisotropy constants, creating a hybrid system that leverages the advantages of both material types to achieve high-density storage while maintaining reliability
2Quantity of substance
If conventional MRAM with MTJ cells is used, then data storage per cell is limited to one bit, but increasing data storage requires larger transistor size
Solution Approach 1:
The patent segments the magnetic domain into multiple controllable regions within a single cell, allowing one cell to store multiple data bits by controlling the magnetization direction in different segments, thereby increasing storage capacity without proportionally increasing transistor size
Solution Approach 2:
The patent utilizes the magnetic dimension (magnetization direction) as an additional degree of freedom for data encoding, allowing multiple bits to be stored in the same physical space by exploiting the directional properties of magnetic domains rather than expanding the transistor footprint
3Quantity of substance
If amorphous soft magnetic material with high magnetic anisotropy constant is used, then data storage capacity increases, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the material composition parameters of amorphous soft magnetic alloys (such as NiFeSiB) to achieve the desired magnetic anisotropy constant while maintaining manufacturability through controlled composition ratios and deposition processes
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 use of amorphous soft magnetic materials with high magnetic anisotropy constants in MRAM devices increases data storage capacity and allows for efficient reading and writing of multiple data bits per cell, enhancing information storage capacity and reducing the energy required for magnetic domain motion.
Implementation Method 1
utilizing an amorphous soft magnetic material with a higher magnetic anisotropy constant, such as NiFeSiB, to form memory tracks that allow for multiple data bits per cell by switching magnetization directions
Implementation Method 2
A magnetic random access memory (MRAM) is an example of a non-volatile magnetic memory and may operate based on a magnetic resistance effect, which takes advantage of spin-dependent conduction peculiar to a nano-magnetic material. An MRAM may operate based on the giant magnetoresistance (GMR) effect
Implementation Method 3
research pursuing commercialization of an MRAM using the TMR layer instead of a GMR layer is more actively being pursued. The TMR effect occurs in an arrangement of ferromagnetic materials having an insulator interposed therebetween
Data Source
AI summary
A magnetic memory device is provided. The magnetic memory device may include a memory track in which a plurality of magnetic domains is formed so that data bits, each of which may be a magnetic domain, are stored in an array. The memory track may be formed of an amorphous soft magnetic material.