Magnetic Thermoelectric Element Density Control for Low-Noise Output
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Solution Overview
Problem
Existing thermoelectric conversion elements using magnetothermoelectric effects face challenges with non-special substrates, such as organic materials, and increasing specific resistance leads to noise generation and reduced power output.
Innovation Solution
A thermoelectric conversion element with a magnetic body on a substrate, where the ratio of measured density to theoretical density is 0.80 or more, utilizing ferromagnetism or antiferromagnetism to improve performance while keeping specific resistance low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the specific resistance of the magnetic body is increased to improve the Nernst coefficient, then the thermoelectric conversion performance is improved, but noise generation increases and power generation output is reduced
Solution Approach 1:
The patent changes the density parameter of the magnetic body, specifically controlling the ratio of measured density to theoretical density to be 0.80 or more. This parameter change allows optimization of both electrical conductivity and thermoelectric conversion performance, resolving the contradiction between improving Nernst coefficient and maintaining low noise with adequate power output
Solution Approach 2:
The patent employs composite material structures including the magnetic body in combination with specific substrate materials (such as MgO surface layers) and conductive materials. This composite approach enables independent optimization of different functional requirements - the magnetic body provides magnetothermoelectric effect while the composite structure maintains appropriate electrical conductivity and reduces noise
2Ease of manufacture
If a non-special substrate such as organic material is used, then device complexity and manufacturing cost are reduced, but thermoelectric conversion performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a specialized surface layer (such as MgO) on the substrate surface where the magnetic body is disposed. This local modification of the substrate surface provides the necessary crystal structure for high magnetothermoelectric effect while allowing the bulk substrate to remain simple and inexpensive organic material
Solution Approach 2:
The patent introduces an intermediary surface layer between the simple organic substrate and the magnetic body. This intermediary layer serves as a mediator that provides the required crystal structure for high performance thermoelectric conversion while allowing the use of simple, inexpensive organic substrate materials
3Power
If the density ratio of the magnetic body is increased to improve thermoelectric conversion performance, then conversion efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent identifies and controls the density ratio parameter, setting it to 0.80 or more. This specific parameter threshold provides a clear manufacturing target that balances performance requirements with manufacturing feasibility, avoiding overly stringent precision requirements while ensuring adequate conversion efficiency
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 configuration enhances thermoelectric conversion performance, reduces noise, and increases power generation output even with non-special substrates, allowing for thinner designs and lower energy consumption.
Implementation Method 1
The anomalous Nernst effect is a phenomenon that a voltage is generated in a direction orthogonal to both the magnetization direction and the temperature gradient when a temperature difference is caused by a heat flow through a magnetic material
Implementation Method 2
a magnetic body disposed on the substrate and having ferromagnetism or antiferromagnetism
Implementation Method 3
a magnetic body disposed on the substrate and having ferromagnetism or antiferromagnetism
Data Source
AI summary
A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. A ratio of a measured density of the magnetic bodies to a theoretical density of the magnetic bodies is 0.80 or more.