Zigzag Magnetic Track for High-Density Domain Wall Storage
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Solution Overview
Problem
Conventional non-volatile information storage devices, such as HDDs and flash memories, face challenges with mechanical reliability, power consumption, and limited storage capacity due to the use of moving mechanical systems and soft magnetic materials, which hinder increased recording density and power efficiency.
Innovation Solution
A magnetic track with a zigzag shape, comprising parallel and stacked ferromagnetic layers with perpendicular magnetic anisotropy, and a buffer track, connected by transistors for current application, allowing for reduced power consumption and enhanced storage capacity through magnetic domain wall movement without mechanical movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If soft magnetic material with horizontal magnetic anisotropy is used, then magnetic domain wall movement can be achieved, but recording density cannot be enhanced due to large domain wall width
Solution Approach 1:
The patent changes the magnetic anisotropy parameter from horizontal to perpendicular orientation by using ferromagnetic materials with perpendicular magnetic anisotropy. This parameter change enables narrower magnetic domain walls (tens of nanometers instead of several hundred nanometers), thereby significantly enhancing recording density while maintaining the ability to move domain walls for data storage operations
2Use of energy by moving object
If soft magnetic material is used for magnetic track, then magnetic domain wall movement is enabled, but electric power consumption increases due to large current requirement
Solution Approach 1:
The patent changes the material parameter from soft magnetic material to ferromagnetic material with perpendicular magnetic anisotropy. This material parameter change reduces the current density requirement for moving magnetic domain walls from about 10^8 A/m2 to lower values, thereby significantly reducing electric power consumption while enabling the same domain wall movement functionality
3Quantity of substance
If U-shaped magnetic track with limited height is used, then manufacturing is feasible with present technology, but storage capacity cannot be markedly increased
Solution Approach 1:
The patent transitions from a planar U-shaped magnetic track to a three-dimensional zigzag-shaped magnetic track with multiple stacked ferromagnetic layers. This dimensional change allows the magnetic track to extend vertically with greater height (beyond 20 μm) while maintaining manufacturability, thereby markedly increasing storage capacity through additional vertical space for storing more magnetic domains
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 increases recording density and storage capacity while reducing power consumption by utilizing ferromagnetic materials with perpendicular magnetic anisotropy, enabling more efficient data storage and improved reliability.
Implementation Method 1
Magnetic fine regions constituting a magnetic material may be called magnetic domains. Directions of magnetic moments in a magnetic domain are the same. A magnetic domain wall may be a boundary region of magnetic domains having different magnetization directions from each other, and may have a predetermined or given volume. Such magnetic domains and magnetic domain walls may be moved in a magnetic material by a current or magnetic field applied to the magnetic material.
Implementation Method 2
the plurality of first magnetic layers may be a plurality of ferromagnetic layers having perpendicular magnetic anisotropy
Data Source
AI summary
Provided are a magnetic track using magnetic domain wall movement and an information storage device including the same. A magnetic track may comprise a zigzag shaped storage track including a plurality of first magnetic layers in parallel with each other, and stacked separate from each other, and a plurality of second magnetic layers for connecting the plurality of first magnetic layers. The information storage device may include the magnetic track having a plurality of magnetic domains, current applying device connected to the magnetic track, and a read/write device on a middle portion of the magnetic track.