AFM Probe Tip Inspection With Rough Multi-Height Test Patterns
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Solution Overview
Problem
Existing atomic force microscopes (AFMs) face challenges in accurately distinguishing between sample abnormalities and probe tip defects, leading to unreliable inspections and potential damage to samples during scanning.
Innovation Solution
The method involves using characterization samples with varying heights and surface roughness to inspect the AFM probe tip, determining its normalcy, and replacing it if abnormal, thereby ensuring reliable sample inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a probe tip is used to scan a sample without prior inspection, then inspection speed is maintained, but measurement precision deteriorates due to inability to distinguish tip defects from sample abnormalities
Solution Approach 1:
The patent applies preliminary action by inspecting the probe tip using a characterization sample before inspecting the actual target sample. This preliminary inspection establishes baseline tip performance and enables accurate interpretation of subsequent sample measurements, resolving the contradiction by ensuring measurement precision is maintained while minimizing time loss through efficient tip characterization.
Solution Approach 2:
The patent uses a characterization sample as an intermediary between the probe tip and the target sample. This intermediary enables indirect assessment of tip condition without directly examining the valuable target sample, allowing measurement precision to be verified while preserving sample integrity and reducing inspection time.
2Productivity
If a probe tip continues to be used after damage, then productivity is maintained, but object-affected harmful factors increase due to potential sample damage
Solution Approach 1:
The patent performs preliminary tip inspection using a characterization sample before target sample inspection. This allows detection of tip damage early, enabling operators to replace tips before they can damage valuable samples, thus maintaining productivity while eliminating sample damage risk.
Solution Approach 2:
The patent converts the potentially harmful effect of tip wear into a benefit by using the gradual degradation as a diagnostic signal. The characterization sample reveals tip condition changes that would otherwise go unnoticed, allowing proactive tip replacement before sample damage occurs, thereby maintaining both productivity and sample safety.
3Measurement precision
If complex tip inspection procedures are implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent extracts the tip inspection function into a separate, standardized procedure using a dedicated characterization sample. This separates tip evaluation from target sample inspection, simplifying the overall system while maintaining measurement precision through focused, repeatable tip characterization.
Solution Approach 2:
The patent uses parameter changes in the characterization sample (different patterns, heights, and materials) to comprehensively evaluate tip performance. By varying these parameters systematically, the method achieves high measurement precision without requiring complex instrumentation, relying instead on intelligent use of standardized test structures.
Data Source
AI summary
A method of operating an atomic force microscope (AFM) is provided. The method includes inspecting a sample by using the AFM and inspecting a tip of a probe of the AFM by using a characterization sample. The characterization sample includes a first characterization pattern that includes a line and space pattern of a first height, a second characterization pattern that includes a line and space pattern of a second height that is lower than the first height, and a third characterization pattern that includes a line and space pattern of a third height that is lower than the second height, and includes a rough surface.