Magnetic Recording Layer with Ferromagnetic Bits in AFM Matrix
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Solution Overview
Problem
Existing data storage devices face challenges in achieving higher areal density capability (ADC) due to thermal instability and inhomogeneous field patterns in magnetic recording media, particularly in heat-assisted magnetic recording (HAMR) technology, which limits the increase in storage density.
Innovation Solution
A magnetic recording layer comprising ferromagnetic, discrete regions within an antiferromagnetic matrix, where each region corresponds to a magnetic domain, is formed via an 'on-disk' method, utilizing methods like laser heating or electric field application to convert antiferromagnetic regions into ferromagnetic regions, ensuring thermal stability and high ADC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If heat-assisted magnetic recording (HAMR) is used to increase areal density capability, then storage density is improved, but thermal instability occurs in the magnetic recording media
Solution Approach 1:
The magnetic recording layer is segmented into an antiferromagnetic matrix with embedded ferromagnetic discrete regions. Each ferromagnetic region corresponds to a magnetic domain for storing a bit of data, creating spatially separated storage units that maintain thermal stability while enabling high density
Solution Approach 2:
The invention changes the magnetic state parameter of specific regions by converting antiferromagnetic material into ferromagnetic material through laser heating or electric field application. This parameter change enables the creation of stable ferromagnetic bits within the antiferromagnetic matrix, resolving the thermal stability issue
2Quantity of substance
If smaller magnetic domains are used to increase areal density, then storage capacity is improved, but thermal instability increases
Solution Approach 1:
The invention uses a composite structure combining antiferromagnetic matrix material with ferromagnetic discrete region material. This composite approach allows smaller magnetic domains to be embedded in a stable antiferromagnetic environment, providing both high areal density and thermal stability
Solution Approach 2:
The antiferromagnetic matrix provides a stable local environment for each ferromagnetic discrete region. Each ferromagnetic region is locally stabilized by the surrounding antiferromagnetic material, preventing thermal instability even as domain size decreases for higher density
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 provides improved areal density capability (ADC) and signal-to-noise ratio (SNR) by enabling smaller, thermally stable ferromagnetic regions, allowing for higher storage density without thermal instability issues.
Implementation Method 1
utilizing methods like laser heating or electric field application to convert antiferromagnetic regions into ferromagnetic regions
Implementation Method 2
Heating the magnetic recording disk temporarily reduces the coercivity of the magnetic media, which enables the read/write head to change the magnetization direction of a bit and thus store information to the magnetic media
Data Source
AI summary
A magnetic stack having a magnetic recording layer. The magnetic recording layer includes a plurality of ferromagnetic, discrete regions located within a matrix of at least one magnetic composition that is antiferromagnetic. Each ferromagnetic, discrete region corresponds to a magnetic domain for storing a bit of data. Related data storage devices, systems, and methods.