Magnetic Nanowire Plasma Sputtering Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing magnetic nanowires face challenges such as unwanted oxide formation, low production yield, and difficulty in scaling up processes, which affect the quality and efficiency of nanowire production, particularly in achieving high purity and controlled diameter and alignment of nanowires.
Innovation Solution
A process involving plasma sputtering of magnetic materials, where sputtered target atoms are ionized to increase collision probability and grow nanoparticles, which are then collected on a substrate in a controlled atmosphere to form high-quality nanowires with minimal oxide presence and precise control over structure and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrothermal reduction or thermal decomposition methods are used to produce magnetic nanowires, then nanowires can be formed with desired magnetic properties, but unwanted oxide formation occurs on the nanowire surface and between nanoparticles
Solution Approach 1:
The patent employs an inert atmosphere (argon or vacuum) during the sputtering process to prevent oxidation of magnetic nanoparticles. The sputtering chamber is maintained at low pressure with inert gas, and the substrate is heated in this protective atmosphere, ensuring that nanowires form without surface or inter-particle oxide layers that would degrade magnetic properties.
2Manufacturing precision
If template methods are used for nanowire production, then nanowire diameter and alignment can be controlled, but the template must be removed and large amounts of material cannot be produced
Solution Approach 1:
The patent extracts and eliminates the template from the production process entirely. Instead of using porous templates that require removal and limit scale, the invention uses direct sputtering deposition where magnetic nanoparticles are deposited and self-assembled on a substrate without any template, enabling both precise diameter control and large-scale production.
Solution Approach 2:
The magnetic nanoparticles self-assemble into nanowire structures through magnetic field alignment during deposition. The nanoparticles inherently organize themselves into linear chains aligned with the magnetic field direction, eliminating the need for external templates while maintaining precise alignment and diameter control.
3Manufacturing precision
If pulsed laser ablation is used to produce magnetic nanowires, then nanowires can be formed with controlled structure, but the process is slow and not suitable for large scale production
Solution Approach 1:
The patent replaces the slow, sequential pulsed laser ablation process with a continuous sputtering deposition process. Instead of removing material layer by layer with laser pulses, the sputtering method continuously deposits magnetic material that self-assembles into nanowires, dramatically increasing production rate while maintaining structural control through magnetic field alignment.
4Reliability
If thermal decomposition of iron pentacarbonyl is used, then ferromagnetic iron nanowires can be produced, but CO gas from decomposition causes unwanted oxide formation between nanoparticles
Solution Approach 1:
The patent uses sputtering in an inert argon atmosphere instead of thermal decomposition of iron pentacarbonyl. This eliminates the source of CO gas that causes oxidation, while the inert atmosphere protects the magnetic nanoparticles from oxidation during deposition and heating, preserving ferromagnetic properties without oxide contamination.
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 process enhances the production yield and quality of magnetic nanowires by minimizing oxide formation, ensuring high bonding strength and electrical conductivity, and allowing for scalable industrial production while maintaining control over nanowire diameter and alignment.
Implementation Method 1
sputtering atoms from a first electrically conducting target made of a first magnetic material, wherein sputtering is performed in a controlled atmosphere using a plasma
Implementation Method 2
ionising at least a portion of the sputtered target atoms in said plasma
Implementation Method 3
the use of magnetic fields for obtaining a desired orientation of the nanowires has been proposed
Data Source
AI summary
A process for producing magnetic nanowires of high quality and a good production yield is disclosed. The process comprises sputtering a target of a magnetic material using a plasma, growing nanoparticles from the sputtered matter to magnetic nanoparticles and collecting the magnetic nanoparticles on a substrate in the form of nanowires.