Magnetic Matter Optical Scattering for Non-Destructive Metrology
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Solution Overview
Problem
Current methods for determining the magnetic properties of magnetic domains in MRAM require destructive processes, which violate the physical integrity of the magnetic matter, and there is a lack of non-destructive methods for measuring critical parameters like magnetic thickness, saturation magnetization, and exchange constant at the wafer level for CMOS-compatible magnetic memory manufacturing.
Innovation Solution
A non-destructive method using optical scattering techniques to determine magnetic thickness, saturation magnetization, and exchange interaction by applying a magnetic field and directing light at varying angles, analyzing the scattered light signatures to fit dispersion relations and measure these parameters without damaging the magnetic matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods are used to determine magnetic properties, then measurement capability is achieved, but physical integrity of the magnetic matter is violated
Solution Approach 1:
The patent replaces destructive mechanical or electrical measurement methods with optical scattering techniques. Light is directed at the magnetic matter and the scattered light signatures are analyzed to determine magnetic properties (magnetic thickness, saturation magnetization, exchange constant) without physical contact or damage to the sample.
Solution Approach 2:
The patent introduces light as an intermediary medium to transfer information about magnetic properties without directly interacting with or damaging the magnetic matter. The optical scattering process allows indirect measurement of magnetic characteristics through the interaction of light with spin waves in the magnetic material.
2Object-affected harmful factors
If non-destructive methods are implemented, then physical integrity is maintained, but measurement accuracy and reliability may be compromised
Solution Approach 1:
The patent measures magnetic properties by analyzing light scattering in multiple dimensions - varying incident angles and analyzing scattered light at different angles. This multi-dimensional optical measurement approach provides sufficient data to accurately determine magnetic thickness, saturation magnetization, and exchange constant without destructive methods.
Solution Approach 2:
The patent changes optical parameters (incident angle, wavelength) to extract different magnetic property information. By varying the incident angle and analyzing the dispersion relation of scattered light, the method can independently determine multiple magnetic parameters with high accuracy while maintaining sample integrity.
3Productivity
If wafer-level measurement is achieved, then manufacturing productivity is improved, but measurement complexity increases
Solution Approach 1:
The patent creates a universal measurement system that can determine multiple magnetic properties (magnetic thickness, saturation magnetization, exchange constant) using a single optical scattering technique. This multi-functional approach enables comprehensive characterization of magnetic memory devices at the wafer level without requiring multiple specialized measurement tools.
Solution Approach 2:
The patent employs dynamic measurement capabilities where the magnetic matter orientation is varied with respect to the magnetic field during measurement. This dynamic approach allows the system to extract multiple magnetic parameters from a single measurement sequence, improving productivity while managing complexity through automated data processing.
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
Enables non-destructive, accurate determination of magnetic properties across a semiconductor wafer, providing a robust metrology tool for inline wafer inspection in microelectronics fabs, ensuring uniformity and quality control of magnetic memory devices.
Implementation Method 1
directing first light on the magnetic matter at a first set of incident angles; receiving a first set of signatures associated with the first light scattered from the magnetic matter
Implementation Method 2
applying a magnetic field to magnetic matter
Data Source
AI summary
A method for determining at least one property of magnetic matter includes: applying a magnetic field to magnetic matter; directing first light on the magnetic matter at a first set of incident angles; receiving a first set of signatures associated with the first light scattered from the magnetic matter; varying orientation of the magnetic matter with respect to the magnetic field; directing second light on the magnetic matter at a second set of incident angles; receiving a second set of signatures associated with the second light scattered from the magnetic matter; determining, by processing the first set and the second set of signatures according to a dispersion relation, at least one property of the magnetic matter.