Magnetic Nanoparticle Storage Density via Carbon Nanotube Segmentation

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Solution Overview

Problem

Current magnetic storage media technologies face limitations in increasing storage density due to the laws of physics restricting the size of magnetic particles deposited directly on substrates, necessitating new approaches to enhance magnetic storage media density beyond these limits.

Innovation Solution

The use of carbon nanotubes containing magnetic nanoparticles, where a magnetic field generator, such as a Helmholtz coil or a carbon nanotube with a nano-wire, is employed to impart polarization to the nanoparticles within the storage media, allowing for increased storage density by organizing nanoparticles into tracks and sectors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If magnetic particles are deposited directly on substrate to increase storage density, then storage density improves, but physical laws limit the minimum particle size and thus the maximum achievable density

Engineering Contradiction:

Improvestorage densityVSAvoidparticle size limitation

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The magnetic storage medium is segmented into multiple layers: a substrate layer, a first magnetic particle layer, a nonmagnetic intermediate layer, and a second magnetic particle layer. This segmentation allows each layer to be optimized independently, enabling higher storage density by overcoming the physical limitations of single-layer direct deposition through multi-layer structuring.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from two-dimensional direct deposition on substrate to three-dimensional multi-layer stacking with vertical separation. By introducing a nonmagnetic intermediate layer between magnetic particle layers, the system utilizes the vertical dimension to increase storage capacity beyond the constraints of planar particle density.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If magnetic particle size is reduced to increase storage density, then storage density improves, but magnetic signal detection becomes difficult

Engineering Contradiction:

Improvestorage densityVSAvoidmagnetic signal detection

Core Design Contradiction:

Quantity of substanceVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies different material properties to different layers: the first and second magnetic particle layers contain magnetic particles with specific coercivity ranges optimized for their respective functions, while the nonmagnetic intermediate layer provides magnetic isolation. This local optimization of magnetic properties enables reliable signal detection even with reduced particle sizes by ensuring each layer contributes appropriately to the overall magnetic signal.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The magnetic particle layers are designed with asymmetric properties relative to the nonmagnetic intermediate layer. The intermediate layer has zero or negligible magnetic coercivity, creating a clear magnetic contrast that enhances detectability of the magnetic signals from the particle layers, thereby improving signal detection difficulty despite reduced particle dimensions.

Inventive Principle:

Principle #4Asymmetry

3Quantity of substance

If magnetic storage density is increased beyond current limits, then storage capacity improves, but traditional direct deposition methods reach physical limitations

Engineering Contradiction:

Improvemagnetic storage densityVSAvoiddeposition method limitation

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The nonmagnetic intermediate layer is deposited and prepared in advance before the second magnetic particle layer is applied. This preliminary action creates a prepared substrate that enables subsequent high-density magnetic particle deposition by providing magnetic isolation and a stable foundation, thereby facilitating storage densities that would be unachievable with direct deposition methods alone.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The nonmagnetic intermediate layer acts as an intermediary between the first and second magnetic particle layers. This intermediate layer facilitates the manufacturing process by providing magnetic isolation that prevents signal interference, enabling higher storage densities to be achieved through multi-layer construction without the technical constraints of direct deposition.

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 method significantly increases storage density by effectively organizing magnetic nanoparticles within carbon nanotubes, enabling higher data storage capabilities and overcoming the physical limitations of traditional magnetic storage media.

Implementation Method 1

generating a magnetic field with the magnetic field generator

Methodology Applied

Scientific EffectMagnetic field generation: Electromagnetic Induction

Implementation Method 2

imparting a polarization to at least one of the magnetic nanoparticles in the magnetic media with the magnetic field. The polarization represents information

Methodology Applied

Scientific EffectMagnetic polarization: Magnetism

Data Source

PatentUS9633676B2Magnetic storage medium comprised of magnetic nanoparticles contained within nanotubes

Publication Date: 2017.04.25 GULA CONSULTING LLC

AI summary

A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within nanotubes (e.g., carbon nanotubes).